diff --git a/src/util/simple_mtx.h b/src/util/simple_mtx.h
index b23c8d2133d..4fc8a0d4df4 100644
--- a/src/util/simple_mtx.h
+++ b/src/util/simple_mtx.h
@@ -25,6 +25,7 @@
 #define _SIMPLE_MTX_H
 
 #include "util/futex.h"
+#include "util/macros.h"
 
 #include "c11/threads.h"