diff --git a/tests/msgb/msgb_test.c b/tests/msgb/msgb_test.c
index a726ef4..ac10382 100644
--- a/tests/msgb/msgb_test.c
+++ b/tests/msgb/msgb_test.c
@@ -195,7 +195,7 @@
 	OSMO_ASSERT(e != 0);
 
 	if (OSMO_PANIC_TRY(&e))
-		msgb_resize_area(msg, NULL, (int)msg->data, 0);
+		msgb_resize_area(msg, NULL, 0, 0);
 	OSMO_ASSERT(e != 0);
 
 	if (OSMO_PANIC_TRY(&e))