diff --git a/shmem/unix/shm.c b/shmem/unix/shm.c
index 463dd941de..5ada669490 100644
--- a/shmem/unix/shm.c
+++ b/shmem/unix/shm.c
@@ -726,6 +726,20 @@ APR_PERMS_SET_IMPLEMENT(shm)
     if (fchmod(fd, apr_unix_perms2mode(perms)))
         return errno;
 
+    return APR_SUCCESS;
+#elif APR_USE_SHMEM_MMAP_TMP
+    apr_shm_t *shm = (apr_shm_t *)theshm;
+    int fd;
+
+    if (!shm->filename)
+        return APR_ENOTIMPL;
+
+    if (chown(shm->filename, uid, gid))
+        return errno;
+
+    if (chmod(shm->filename, apr_unix_perms2mode(perms)))
+        return errno;
+
     return APR_SUCCESS;
 #else
     return APR_ENOTIMPL;