diff --git a/lib/xstrtoul.c b/lib/xstrtoul.c
index 8194c1719..6140bbee2 100644
--- a/lib/xstrtoul.c
+++ b/lib/xstrtoul.c
@@ -1,2 +1,4 @@
-#define STRING_TO_UNSIGNED 1
+#define __strtol strtoul
+#define __strtol_t unsigned long int
+#define __xstrtol xstrtoul
 #include "xstrtol.c"