diff --git a/platform/lang-api/src/com/intellij/psi/codeStyle/CommonCodeStyleSettings.java b/platform/lang-api/src/com/intellij/psi/codeStyle/CommonCodeStyleSettings.java
index 32688de74ead..7a8d84e018be 100644
--- a/platform/lang-api/src/com/intellij/psi/codeStyle/CommonCodeStyleSettings.java
+++ b/platform/lang-api/src/com/intellij/psi/codeStyle/CommonCodeStyleSettings.java
@@ -918,7 +918,7 @@ public class CommonCodeStyleSettings {
 
     @Override
     public void writeExternal(Element element) throws WriteExternalException {
-      DefaultJDOMExternalizer.writeExternal(this, element);
+      DefaultJDOMExternalizer.writeExternal(this, element, new DifferenceFilter<IndentOptions>(this, new IndentOptions()));
     }
 
     public void serialize(Element indentOptionsElement, final IndentOptions defaultOptions) {