diff --git a/epan/tvbtest.c b/epan/tvbtest.c
index d924004c90..f9f5f445d2 100644
--- a/epan/tvbtest.c
+++ b/epan/tvbtest.c
@@ -673,7 +673,7 @@ varint_tests(void)
 		}
 		ENDTRY;
 		if (got_ex != vit->expect_except) {
-			printf("Failed varint #%zu with exception=%d while expected exception=%d\n",
+			printf("Failed varint #%zu with exception=%lu while expected exception=%lu\n",
 				   ix, got_ex, vit->expect_except);
 			failed = TRUE;
 			continue;