diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/history/VcsDiffUtil.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/history/VcsDiffUtil.java
index ccaedc81c1e7..13149175c57a 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/history/VcsDiffUtil.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/history/VcsDiffUtil.java
@@ -96,6 +96,7 @@ public class VcsDiffUtil {
     changesBrowser.setChangesToDisplay(changes);
     dialogBuilder.setCenterPanel(changesBrowser);
     dialogBuilder.setPreferredFocusComponent(changesBrowser.getPreferredFocusedComponent());
+    dialogBuilder.setDimensionServiceKey("VcsDiffUtil.ChangesDialog");
     dialogBuilder.showNotModal();
   }