diff --git a/platform/editor-ui-ex/src/com/intellij/openapi/editor/colors/impl/AbstractColorsScheme.java b/platform/editor-ui-ex/src/com/intellij/openapi/editor/colors/impl/AbstractColorsScheme.java
index 15787a5e6bfb..18e4c995590a 100644
--- a/platform/editor-ui-ex/src/com/intellij/openapi/editor/colors/impl/AbstractColorsScheme.java
+++ b/platform/editor-ui-ex/src/com/intellij/openapi/editor/colors/impl/AbstractColorsScheme.java
@@ -179,7 +179,10 @@ public abstract class AbstractColorsScheme implements EditorColorsScheme {
   
   @Override
   public void setQuickDocFontSize(@NotNull FontSize fontSize) {
-    myQuickDocFontSize = fontSize;
+    if (myQuickDocFontSize != fontSize) {
+      myQuickDocFontSize = fontSize;
+      myIsSaveNeeded = true;
+    }
   }
 
   @Override