diff --git a/.travis.yml b/.travis.yml
index 4273865..40abedb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: go
 
 go:
   - "1.13.x"
+  - "1.15.x"
 
 before_install:
     - sudo apt-get update
diff --git a/btrfs.go b/btrfs.go
index a055890..f9c30b3 100644
--- a/btrfs.go
+++ b/btrfs.go
@@ -275,7 +275,7 @@ func SubvolCreate(path string) error {
 	if len(name) > C.BTRFS_PATH_NAME_MAX {
 		return errors.Errorf("%q too long for subvolume", name)
 	}
-	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(&args.name[0]))
+	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(&args.name[0]))[:C.BTRFS_PATH_NAME_MAX:C.BTRFS_PATH_NAME_MAX]
 	copy(nameptr[:C.BTRFS_PATH_NAME_MAX], []byte(name))
 
 	if err := ioctl(fp.Fd(), C.BTRFS_IOC_SUBVOL_CREATE, uintptr(unsafe.Pointer(&args))); err != nil {
@@ -311,7 +311,7 @@ func SubvolSnapshot(dst, src string, readonly bool) error {
 		return errors.Errorf("%q too long for subvolume", dstname)
 	}
 
-	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(name))
+	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(name))[:C.BTRFS_SUBVOL_NAME_MAX:C.BTRFS_SUBVOL_NAME_MAX]
 	copy(nameptr[:C.BTRFS_SUBVOL_NAME_MAX], []byte(dstname))
 
 	if readonly {
@@ -370,7 +370,7 @@ func SubvolDelete(path string) error {
 		return errors.Errorf("%q too long for subvolume", name)
 	}
 
-	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(&args.name[0]))
+	nameptr := (*[maxByteSliceSize]byte)(unsafe.Pointer(&args.name[0]))[:C.BTRFS_SUBVOL_NAME_MAX:C.BTRFS_SUBVOL_NAME_MAX]
 	copy(nameptr[:C.BTRFS_SUBVOL_NAME_MAX], []byte(name))
 
 	if err := ioctl(fp.Fd(), C.BTRFS_IOC_SNAP_DESTROY, uintptr(unsafe.Pointer(&args))); err != nil {