diff --git a/idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/JetLightProjectDescriptor.java b/idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/JetLightProjectDescriptor.java
index a64ef540f50..e3b3569e348 100644
--- a/idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/JetLightProjectDescriptor.java
+++ b/idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/JetLightProjectDescriptor.java
@@ -25,7 +25,7 @@ import com.intellij.openapi.roots.ModifiableRootModel;
 import com.intellij.testFramework.LightProjectDescriptor;
 import org.jetbrains.annotations.NotNull;
 
-public class JetLightProjectDescriptor implements LightProjectDescriptor {
+public class JetLightProjectDescriptor extends LightProjectDescriptor {
     protected JetLightProjectDescriptor() {
     }