diff --git a/.idea/ant.xml b/.idea/ant.xml
index 54a69565df9..fd12fb59a1d 100644
--- a/.idea/ant.xml
+++ b/.idea/ant.xml
@@ -3,7 +3,7 @@
   <component name="AntConfiguration">
     <buildFile url="file://$PROJECT_DIR$/compiler/frontend/buildLexer.xml" />
     <buildFile url="file://$PROJECT_DIR$/build.xml">
-      <antCommandLine value="-J-XX:MaxPermSize=100m" />
+      <antCommandLine value="-J-XX:MaxPermSize=100m -J-ea" />
       <maximumHeapSize value="1024" />
     </buildFile>
     <buildFile url="file://$PROJECT_DIR$/update_dependencies.xml" />