diff --git a/testpar/t_filters_parallel.c b/testpar/t_filters_parallel.c
index 568801636da..dfe1fd7539e 100644
--- a/testpar/t_filters_parallel.c
+++ b/testpar/t_filters_parallel.c
@@ -4396,6 +4396,8 @@ test_read_one_chunk_filtered_dataset(const char *parent_group, H5Z_filter_t filt
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -4433,6 +4435,8 @@ test_read_one_chunk_filtered_dataset(const char *parent_group, H5Z_filter_t filt
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -4612,6 +4616,8 @@ test_read_filtered_dataset_no_overlap(const char *parent_group, H5Z_filter_t fil
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -4649,6 +4655,8 @@ test_read_filtered_dataset_no_overlap(const char *parent_group, H5Z_filter_t fil
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -4830,6 +4838,8 @@ test_read_filtered_dataset_overlap(const char *parent_group, H5Z_filter_t filter
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -4867,6 +4877,8 @@ test_read_filtered_dataset_overlap(const char *parent_group, H5Z_filter_t filter
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -5071,6 +5083,8 @@ test_read_filtered_dataset_single_no_selection(const char *parent_group, H5Z_fil
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -5109,6 +5123,8 @@ test_read_filtered_dataset_single_no_selection(const char *parent_group, H5Z_fil
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -5299,6 +5315,8 @@ test_read_filtered_dataset_all_no_selection(const char *parent_group, H5Z_filter
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -5337,6 +5355,8 @@ test_read_filtered_dataset_all_no_selection(const char *parent_group, H5Z_filter
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -5485,6 +5505,8 @@ test_read_filtered_dataset_point_selection(const char *parent_group, H5Z_filter_
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -5523,6 +5545,8 @@ test_read_filtered_dataset_point_selection(const char *parent_group, H5Z_filter_
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -5737,6 +5761,8 @@ test_read_filtered_dataset_interleaved_read(const char *parent_group, H5Z_filter
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -5774,6 +5800,8 @@ test_read_filtered_dataset_interleaved_read(const char *parent_group, H5Z_filter
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -5973,6 +6001,8 @@ test_read_3d_filtered_dataset_no_overlap_separate_pages(const char *parent_group
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -6011,6 +6041,8 @@ test_read_3d_filtered_dataset_no_overlap_separate_pages(const char *parent_group
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -6219,6 +6251,8 @@ test_read_transformed_filtered_dataset_no_overlap(const char *parent_group, H5Z_
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -6266,6 +6300,8 @@ test_read_transformed_filtered_dataset_no_overlap(const char *parent_group, H5Z_
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -6458,6 +6494,8 @@ test_read_3d_filtered_dataset_no_overlap_same_pages(const char *parent_group, H5
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -6496,6 +6534,8 @@ test_read_3d_filtered_dataset_no_overlap_same_pages(const char *parent_group, H5
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -6702,6 +6742,8 @@ test_read_3d_filtered_dataset_overlap(const char *parent_group, H5Z_filter_t fil
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -6739,6 +6781,8 @@ test_read_3d_filtered_dataset_overlap(const char *parent_group, H5Z_filter_t fil
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -6967,6 +7011,8 @@ test_read_cmpd_filtered_dataset_no_conversion_unshared(const char *parent_group,
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -7004,6 +7050,8 @@ test_read_cmpd_filtered_dataset_no_conversion_unshared(const char *parent_group,
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -7213,6 +7261,8 @@ test_read_cmpd_filtered_dataset_no_conversion_shared(const char *parent_group, H
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -7250,6 +7300,8 @@ test_read_cmpd_filtered_dataset_no_conversion_shared(const char *parent_group, H
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -7462,6 +7514,8 @@ test_read_cmpd_filtered_dataset_type_conversion_unshared(const char *parent_grou
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -7499,6 +7553,8 @@ test_read_cmpd_filtered_dataset_type_conversion_unshared(const char *parent_grou
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -7717,6 +7773,8 @@ test_read_cmpd_filtered_dataset_type_conversion_shared(const char *parent_group,
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -7754,6 +7812,8 @@ test_read_cmpd_filtered_dataset_type_conversion_shared(const char *parent_group,
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     file_id = H5Fopen(filenames[0], H5F_ACC_RDONLY, fapl_id);
     VRFY((file_id >= 0), "Test file open succeeded");
 
@@ -7908,6 +7968,8 @@ test_write_serial_read_parallel(const char *parent_group, H5Z_filter_t filter_id
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     /* Write the file on the MAINPROCESS rank */
     if (MAINPROCESS) {
         /* Set up file access property list */
@@ -7964,6 +8026,8 @@ test_write_serial_read_parallel(const char *parent_group, H5Z_filter_t filter_id
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     correct_buf_size = dataset_dims[0] * dataset_dims[1] * dataset_dims[2] * sizeof(C_DATATYPE);
 
     for (size_t dset_idx = 0; dset_idx < num_dsets; dset_idx++) {
@@ -8129,6 +8193,8 @@ test_write_parallel_read_serial(const char *parent_group, H5Z_filter_t filter_id
     VRFY((H5Gclose(group_id) >= 0), "Group close succeeded");
     VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
 
+    MPI_Barrier(comm);
+
     if (MAINPROCESS) {
         plist_id = H5Pcreate(H5P_FILE_ACCESS);
         VRFY((plist_id >= 0), "FAPL creation succeeded");
@@ -8179,6 +8245,8 @@ test_write_parallel_read_serial(const char *parent_group, H5Z_filter_t filter_id
         VRFY((H5Fclose(file_id) >= 0), "File close succeeded");
     }
 
+    MPI_Barrier(comm);
+
     return;
 }