diff --git a/src/lib/hello_test.mbt b/src/lib/hello_test.mbt
index 361d36a..51c2148 100644
--- a/src/lib/hello_test.mbt
+++ b/src/lib/hello_test.mbt
@@ -1,6 +1,6 @@
 ///|
 test "hello" {
   if @lib.hello() != "Hello, world!" {
-    fail!("@lib.hello() != \"Hello, world!\"")
+    fail("@lib.hello() != \"Hello, world!\"")
   }
 }