diff --git a/lib/sl/sl_locl.h b/lib/sl/sl_locl.h
index 9436b8aa3..720ea375d 100644
--- a/lib/sl/sl_locl.h
+++ b/lib/sl/sl_locl.h
@@ -42,6 +42,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <roken.h>
 #include <protos.h>
 
 #include <sl.h>