diff --git a/src/include/string.h b/src/include/string.h
index 56997fad..715e000e 100644
--- a/src/include/string.h
+++ b/src/include/string.h
@@ -14,6 +14,7 @@
 #ifndef ETHERBOOT_STRING_H
 #define ETHERBOOT_STRING_H
 
+#include "stddef.h"
 #include "bits/string.h"