diff --git a/.idea/ant.xml b/.idea/ant.xml
index ee4efe9b293..55e4f8eae9a 100644
--- a/.idea/ant.xml
+++ b/.idea/ant.xml
@@ -4,6 +4,7 @@
     <buildFile url="file://$PROJECT_DIR$/grammar/buildGrammarLexer.xml" />
     <buildFile url="file://$PROJECT_DIR$/compiler/frontend/buildLexer.xml" />
     <buildFile url="file://$PROJECT_DIR$/build.xml">
+      <antCommandLine value="-J-XX:MaxPermSize=100m" />
       <maximumHeapSize value="1024" />
     </buildFile>
     <buildFile url="file://$PROJECT_DIR$/update_dependencies.xml" />