diff --git a/Tools/unix/zxcc/config.h.darwin b/Tools/unix/zxcc/config.h.darwin
index b3df1720..6ed6f3d1 100644
--- a/Tools/unix/zxcc/config.h.darwin
+++ b/Tools/unix/zxcc/config.h.darwin
@@ -2,5 +2,6 @@
 #define HAVE_UTIME_H
 #define HAVE_FCNTL_H
 #define	HAVE_UNISTD_H
+#define HAVE_STRING_H
 #define DARWIN
 //#define FILETRACKER 1