diff --git a/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java b/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java
index c769a28aea44..a80bf6e9ae5b 100644
--- a/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java
+++ b/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java
@@ -96,6 +96,9 @@ public class FileContent extends DiffContent {
         fileContent.setIsEmpty(true);
         fileContent.myTypeForEmpty = FileTypeManager.getInstance().getFileTypeByFileName(name + "." + ext);
       }
+      else {
+        FileTypeManager.getInstance().detectFileTypeFromContent(file);
+      }
       return fileContent;
     }
     throw new IOException("Can not create temp file for revision content");