diff --git a/.idea/ant.xml b/.idea/ant.xml
index 3883d38d93d..ee4efe9b293 100644
--- a/.idea/ant.xml
+++ b/.idea/ant.xml
@@ -4,7 +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">
-      <maximumHeapSize value="512" />
+      <maximumHeapSize value="1024" />
     </buildFile>
     <buildFile url="file://$PROJECT_DIR$/update_dependencies.xml" />
     <buildFile url="file://$PROJECT_DIR$/TeamCityBuild.xml">