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 b0ac9f0a788f..d235f9931ea6 100644
--- a/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java
+++ b/platform/platform-api/src/com/intellij/openapi/diff/FileContent.java
@@ -15,11 +15,13 @@
  */
 package com.intellij.openapi.diff;
 
+import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.fileEditor.FileDocumentManager;
 import com.intellij.openapi.fileEditor.OpenFileDescriptor;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Computable;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.vfs.LocalFileSystem;
 import com.intellij.openapi.vfs.VirtualFile;
@@ -45,7 +47,12 @@ public class FileContent extends DiffContent {
   @Override
   public Document getDocument() {
     if (myDocument == null && DiffContentUtil.isTextFile(myFile)) {
-      myDocument = FileDocumentManager.getInstance().getDocument(myFile);
+      myDocument = ApplicationManager.getApplication().runReadAction(new Computable<Document>() {
+        @Override
+        public Document compute() {
+          return FileDocumentManager.getInstance().getDocument(myFile);
+        }
+      });
     }
     return myDocument;
   }