diff --git a/lib/roken/strerror_r.c b/lib/roken/strerror_r.c
index 440d01141..5155c28cb 100644
--- a/lib/roken/strerror_r.c
+++ b/lib/roken/strerror_r.c
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include "roken.h"
 
 #ifdef _MSC_VER