diff --git a/tests/test-mcore.c b/tests/test-mcore.c
index 25a99ff8..f310ea36 100644
--- a/tests/test-mcore.c
+++ b/tests/test-mcore.c
@@ -885,7 +885,7 @@ static void test_generic_api(void)
   int x = 0, y = 0;
   M_CALL_INIT(GO1, x, y);
   assert(x == 17);
-  assert(y == 43);
+  assert(y == -43);
 
   x = 89;
   M_CALL_INIT(GO2, x, y);