removed warnings in debug mode compilation
diff --git a/skeletons/per_encoder.c b/skeletons/per_encoder.c
index f4bace0..e76ef74 100644
--- a/skeletons/per_encoder.c
+++ b/skeletons/per_encoder.c
@@ -88,7 +88,7 @@
 		}
 	default:
 		*buffer_r = key.buffer;
-		ASN_DEBUG("Complete encoded in %d bits", er.encoded);
+		ASN_DEBUG("Complete encoded in %ld bits", (long)er.encoded);
 		return ((er.encoded + 7) >> 3);
 	}
 }