diff --git a/utils.c b/utils.c
index 0ba4ecbc..e057cf3e 100644
--- a/utils.c
+++ b/utils.c
@@ -1683,7 +1683,7 @@ int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mod
 }
 
 /*
- * __strncpy__null - strncpy with null termination
+ * __strncpy_null - strncpy with null termination
  * @dest:	the target array
  * @src:	the source string
  * @n:		maximum bytes to copy (size of *dest)
@@ -1694,7 +1694,7 @@ int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mod
  * byte ('\0'), to the buffer pointed to by dest, up to a maximum
  * of n bytes.  Then ensure that dest is null-terminated.
  */
-char *__strncpy__null(char *dest, const char *src, size_t n)
+char *__strncpy_null(char *dest, const char *src, size_t n)
 {
 	strncpy(dest, src, n);
 	if (n > 0)
@@ -2969,7 +2969,7 @@ int arg_copy_path(char *dest, const char *src, int destlen)
 	if (len >= PATH_MAX || len >= destlen)
 		return -ENAMETOOLONG;
 
-	__strncpy__null(dest, src, destlen);
+	__strncpy_null(dest, src, destlen);
 
 	return 0;
 }
diff --git a/utils.h b/utils.h
index ff5966d1..9e890f90 100644
--- a/utils.h
+++ b/utils.h
@@ -160,7 +160,7 @@ int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
 int get_label(const char *btrfs_dev, char *label);
 int set_label(const char *btrfs_dev, const char *label);
 
-char *__strncpy__null(char *dest, const char *src, size_t n);
+char *__strncpy_null(char *dest, const char *src, size_t n);
 int is_block_device(const char *file);
 int is_mount_point(const char *file);
 int check_arg_type(const char *input);
@@ -168,7 +168,7 @@ int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose);
 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose);
 u64 btrfs_device_size(int fd, struct stat *st);
 /* Helper to always get proper size of the destination string */
-#define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
+#define strncpy_null(dest, src) __strncpy_null(dest, src, sizeof(dest))
 int test_dev_for_mkfs(const char *file, int force_overwrite);
 int get_label_mounted(const char *mount_path, char *labelp);
 int get_label_unmounted(const char *dev, char *label);