--- Map8.xs
+++ Map8.xs
@@ -348,7 +348,7 @@
 	Map8* m2
 	PREINIT:
 	    STRLEN len;
-	    STRLEN rlen;
+	    int rlen;
 	    char*  res;
 	INPUT:
 	    char* str = SvPV(ST(2), len);