diff --git a/libc/private/bionic_futex.h b/libc/private/bionic_futex.h
index bfc3520..5602af7 100644
--- a/libc/private/bionic_futex.h
+++ b/libc/private/bionic_futex.h
@@ -28,6 +28,7 @@
 #ifndef _BIONIC_FUTEX_H
 #define _BIONIC_FUTEX_H
 
+#include <linux/compiler.h> /* needed for __user in non-uapi futex.h */
 #include <linux/futex.h>
 #include <sys/cdefs.h>