diff --git a/updater/src/com/intellij/updater/DeleteAction.java b/updater/src/com/intellij/updater/DeleteAction.java
index 3dd1b850e415..8bc43ac41bb1 100644
--- a/updater/src/com/intellij/updater/DeleteAction.java
+++ b/updater/src/com/intellij/updater/DeleteAction.java
@@ -51,7 +51,9 @@ public class DeleteAction extends PatchAction {
   }
 
   protected void doRevert(File toFile, File backupFile) throws IOException {
-    Utils.delete(toFile); // make sure there is no directory remained on this path (may remain from previous 'create' actions
-    Utils.copy(backupFile, toFile);
+    if (!toFile.exists() || isModified(toFile)) {
+      Utils.delete(toFile); // make sure there is no directory remained on this path (may remain from previous 'create' actions
+      Utils.copy(backupFile, toFile);
+    }
   }
 }