diff --git a/src/H5Gname.c b/src/H5Gname.c
index 97f3fa9d8f9..ed6d19b961e 100644
--- a/src/H5Gname.c
+++ b/src/H5Gname.c
@@ -1040,7 +1040,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5G__get_name_by_addr_cb(hid_t gid, const char *path, const H5O_loc_t *obj_oloc, void *_udata)
+H5G__get_name_by_addr_cb(hid_t H5_ATTR_UNUSED gid, const char *path, const H5O_loc_t *obj_oloc, void *_udata)
 {
     H5G_gnba_iter_t *udata     = (H5G_gnba_iter_t *)_udata; /* User data for iteration */
     herr_t           ret_value = H5_ITER_CONT;              /* Return value */
diff --git a/src/H5Ocopy.c b/src/H5Ocopy.c
index 3a26b5ca207..7bd7f389529 100644
--- a/src/H5Ocopy.c
+++ b/src/H5Ocopy.c
@@ -1343,8 +1343,8 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5O__copy_search_comm_dt_cb(hid_t H5_ATTR_UNUSED group, const char *name, const H5O_loc_t *obj_oloc,
-                            void *_udata)
+H5O__copy_search_comm_dt_cb(hid_t H5_ATTR_UNUSED group, const char H5_ATTR_UNUSED *name,
+                            const H5O_loc_t *obj_oloc, void *_udata)
 {
     H5O_copy_search_comm_dt_ud_t *udata =
         (H5O_copy_search_comm_dt_ud_t *)_udata; /* Skip list of dtypes in dest file */