diff --git a/fs/mmap/fs_rammap.c b/fs/mmap/fs_rammap.c
index fc3ec3b4085..0f3c4f2017d 100644
--- a/fs/mmap/fs_rammap.c
+++ b/fs/mmap/fs_rammap.c
@@ -52,7 +52,7 @@ static int unmap_rammap(FAR struct task_group_s *group,
                         FAR void *start,
                         size_t length)
 {
-  FAR void *newaddr;
+  FAR void *newaddr = NULL;
   off_t offset;
   bool kernel = entry->priv.i;
   int ret = OK;