diff --git a/build/conf/classVersions.txt b/build/conf/classVersions.txt
index 869a615abecd..8c5884f6808a 100644
--- a/build/conf/classVersions.txt
+++ b/build/conf/classVersions.txt
@@ -28,7 +28,7 @@
 
 1.6 =>
 
-1.3 => lib/idea_rt.jar
+;1.3 => lib/idea_rt.jar
 
 1.7 => lib/fxHelpBrowser.jar
 1.7 => lib/optimizedFileManager.jar