diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 1239680..f306cb8 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -562,6 +562,7 @@
 /* -------------------------------------------------------------------- */
 /* Methods */
 
+#include "stringlib/stringdefs.h"
 #define STRINGLIB_CHAR char
 
 #define STRINGLIB_CMP memcmp