diff --git a/src/iperf_api.c b/src/iperf_api.c
index daa157cac..dafbadf65 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -2085,14 +2085,14 @@ int test_is_authorized(struct iperf_test *test){
         int ret = check_authentication(username, password, ts, test->server_authorized_users, test->server_skew_threshold);
         if (ret == 0){
             if (test->debug) {
-              iperf_printf(test, report_authentication_succeeded, username, ts);
+              iperf_printf(test, report_authentication_succeeded, username, (uint64_t)ts);
             }
             free(username);
             free(password);
             return 0;
         } else {
             if (test->debug) {
-                iperf_printf(test, report_authentication_failed, ret, username, ts);
+                iperf_printf(test, report_authentication_failed, ret, username, (uint64_t)ts);
             }
             free(username);
             free(password);
@@ -3594,7 +3594,7 @@ iperf_print_intermediate(struct iperf_test *test)
 
         iperf_size_t bytes = 0;
         double bandwidth;
-        int retransmits = 0;
+        int64_t retransmits = 0;
         double start_time, end_time;
 
         int64_t total_packets = 0, lost_packets = 0;
@@ -3670,7 +3670,7 @@ iperf_print_intermediate(struct iperf_test *test)
                     if (test->sender_has_retransmits == 1 && stream_must_be_sender) {
                         /* Interval sum, TCP with retransmits. */
                         if (test->json_output)
-                            cJSON_AddItemToObject(json_interval, sum_name, iperf_json_printf("start: %f  end: %f  seconds: %f  bytes: %d  bits_per_second: %f  retransmits: %d  omitted: %b sender: %b", (double) start_time, (double) end_time, (double) irp->interval_duration, (int64_t) bytes, bandwidth * 8, (int64_t) retransmits, irp->omitted, stream_must_be_sender)); /* XXX irp->omitted or test->omitting? */
+                            cJSON_AddItemToObject(json_interval, sum_name, iperf_json_printf("start: %f  end: %f  seconds: %f  bytes: %d  bits_per_second: %f  retransmits: %d  omitted: %b sender: %b", (double) start_time, (double) end_time, (double) irp->interval_duration, (int64_t) bytes, bandwidth * 8, retransmits, irp->omitted, stream_must_be_sender)); /* XXX irp->omitted or test->omitting? */
                         else
                             iperf_printf(test, report_sum_bw_retrans_format, mbuf, start_time, end_time, ubuf, nbuf, retransmits, irp->omitted?report_omitted:""); /* XXX irp->omitted or test->omitting? */
                     } else {
diff --git a/src/iperf_locale.c b/src/iperf_locale.c
index 9d94e0234..cfdba5826 100644
--- a/src/iperf_locale.c
+++ b/src/iperf_locale.c
@@ -292,10 +292,10 @@ const char test_start_time[] =
 "Starting Test: protocol: %s, %d streams, %d byte blocks, omitting %d seconds, %d second test, tos %d\n";
 
 const char test_start_bytes[] =
-"Starting Test: protocol: %s, %d streams, %d byte blocks, omitting %d seconds, %llu bytes to send, tos %d\n";
+"Starting Test: protocol: %s, %d streams, %d byte blocks, omitting %d seconds, %"PRIuFAST64" bytes to send, tos %d\n";
 
 const char test_start_blocks[] =
-"Starting Test: protocol: %s, %d streams, %d byte blocks, omitting %d seconds, %d blocks to send, tos %d\n";
+"Starting Test: protocol: %s, %d streams, %d byte blocks, omitting %d seconds, %"PRIuFAST64" bytes to send, tos %d\n";
 
 
 /* -------------------------------------------------------------------
@@ -309,10 +309,10 @@ const char report_connecting[] =
 "Connecting to host %s, port %d\n";
 
 const char report_authentication_succeeded[] =
-"Authentication succeeded for user '%s' ts %ld\n";
+"Authentication succeeded for user '%s' ts %" PRIu64 "\n";
 
 const char report_authentication_failed[] =
-"Authentication failed with return code %d for user '%s' ts %ld\n";
+"Authentication failed with return code %d for user '%s' ts %" PRIu64 "\n";
 
 const char report_reverse[] =
 "Reverse mode, remote host %s is sending\n";
@@ -381,10 +381,10 @@ const char report_bw_format[] =
 "[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec                  %s\n";
 
 const char report_bw_retrans_format[] =
-"[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3u             %s\n";
+"[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3ld            %s\n";
 
 const char report_bw_retrans_cwnd_format[] =
-"[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3u   %ss       %s\n";
+"[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3ld   %ss       %s\n";
 
 const char report_bw_udp_format[] =
 "[%3d]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %5.3f ms  %" PRId64 "/%" PRId64 " (%.2g%%)  %s\n";
@@ -402,7 +402,7 @@ const char report_sum_bw_format[] =
 "[SUM]%s %6.2f-%-6.2f sec  %ss  %ss/sec                  %s\n";
 
 const char report_sum_bw_retrans_format[] =
-"[SUM]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3d             %s\n";
+"[SUM]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %3"PRId64"             %s\n";
 
 const char report_sum_bw_udp_format[] =
 "[SUM]%s %6.2f-%-6.2f sec  %ss  %ss/sec  %5.3f ms  %" PRId64 "/%" PRId64 " (%.2g%%)  %s\n";
@@ -419,7 +419,7 @@ const char report_outoforder[] =
 "[%3d]%s %4.1f-%4.1f sec  %d datagrams received out-of-order\n";
 
 const char report_sum_outoforder[] =
-"[SUM]%s %4.1f-%4.1f sec  %d datagrams received out-of-order\n";
+"[SUM]%s %4.1f-%4.1f sec  %"PRIu64" datagrams received out-of-order\n";
 
 const char report_peer[] =
 "[%3d] local %s port %u connected with %s port %u\n";