diff --git a/compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java b/compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java
index 19a00a54480..826ed5fb3c4 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java
@@ -78,7 +78,7 @@ public class StdlibTest extends CodegenTestCase {
     }
 
     public void testKt789 () {
-//        blackBoxFile("regressions/kt789.jet");
+        blackBoxFile("regressions/kt789.jet");
     }
 
     public void testKt828 () {