diff --git a/src/commonlib/include/commonlib/helpers.h b/src/commonlib/include/commonlib/helpers.h
index 0a796ba85b..f2acedca0f 100644
--- a/src/commonlib/include/commonlib/helpers.h
+++ b/src/commonlib/include/commonlib/helpers.h
@@ -15,6 +15,10 @@
 #define COMMONLIB_HELPERS_H
 /* This file is for helpers for both coreboot firmware and its utilities. */
 
+#ifndef __ASSEMBLER__
+#include <stddef.h>
+#endif
+
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 #endif