diff --git a/src/basictypes.h b/src/basictypes.h
index 7787ccb58..ec9d99795 100644
--- a/src/basictypes.h
+++ b/src/basictypes.h
@@ -1,6 +1,7 @@
 #ifndef __BASICTYPES_H
 #define __BASICTYPES_H
 
+#include <stddef.h>
 #include <stdint.h>
 
 typedef uint32_t				BITFIELD;