fix warnings
diff --git a/skeletons/tests/check-GeneralizedTime.c b/skeletons/tests/check-GeneralizedTime.c
index 63d2e66..4b1fd18 100644
--- a/skeletons/tests/check-GeneralizedTime.c
+++ b/skeletons/tests/check-GeneralizedTime.c
@@ -54,7 +54,7 @@
 		assert(expect);
 		printf("[%s] vs [%s] (%d)\n",
 			gt->buf, expect, force_gmt);
-		assert(gt->size == (int)strlen((char *)gt->buf));
+		assert(gt->size == strlen((char *)gt->buf));
 		assert(!strcmp((char *)gt->buf, expect));
 	} else {
 		assert(!expect);