diff --git a/subsys/fs/fuse_fs_access_bottom.c b/subsys/fs/fuse_fs_access_bottom.c
index e3d3cd8b96e..1bde305d4f0 100644
--- a/subsys/fs/fuse_fs_access_bottom.c
+++ b/subsys/fs/fuse_fs_access_bottom.c
@@ -10,6 +10,7 @@
 #undef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 700
 
+#include <stddef.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>