diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CAutoIndentStrategy.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CAutoIndentStrategy.java
index 296ce56f388..9cec200aa12 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CAutoIndentStrategy.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CAutoIndentStrategy.java
@@ -28,6 +28,7 @@ import org.eclipse.jface.text.TextUtilities;
 import org.eclipse.jface.text.rules.FastPartitioner;
 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.part.MultiPageEditorPart;
 import org.eclipse.ui.texteditor.ITextEditorExtension3;
 
 import org.eclipse.cdt.core.model.ICProject;
@@ -1169,6 +1170,9 @@ public class CAutoIndentStrategy extends DefaultIndentLineAutoEditStrategy {
 		IWorkbenchPage page = CUIPlugin.getActivePage();
 		if (page != null)  {
 			IEditorPart part = page.getActiveEditor();
+			if (part instanceof MultiPageEditorPart) {
+				part= (IEditorPart)part.getAdapter(ITextEditorExtension3.class);
+			}
 			if (part instanceof ITextEditorExtension3) {
 				ITextEditorExtension3 extension = (ITextEditorExtension3) part;
 				return extension.getInsertMode() == ITextEditorExtension3.SMART_INSERT;
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CStringAutoIndentStrategy.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CStringAutoIndentStrategy.java
index 8f959b6f2f0..d1653bee20c 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CStringAutoIndentStrategy.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CStringAutoIndentStrategy.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -8,6 +8,7 @@
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Sergey Prigogin, Google
+ *     Anton Leherbauer (Wind River Systems)
  *******************************************************************************/
 package org.eclipse.cdt.internal.ui.text;
 
@@ -22,6 +23,7 @@ import org.eclipse.jface.text.TextUtilities;
 
 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.part.MultiPageEditorPart;
 import org.eclipse.ui.texteditor.ITextEditorExtension3;
 
 import org.eclipse.cdt.core.model.ICProject;
@@ -160,6 +162,9 @@ public class CStringAutoIndentStrategy extends DefaultIndentLineAutoEditStrategy
 		IWorkbenchPage page= CUIPlugin.getActivePage();
 		if (page != null)  {
 			IEditorPart part= page.getActiveEditor();
+			if (part instanceof MultiPageEditorPart) {
+				part= (IEditorPart)part.getAdapter(ITextEditorExtension3.class);
+			}
 			if (part instanceof ITextEditorExtension3) {
 				ITextEditorExtension3 extension= (ITextEditorExtension3) part;
 				return extension.getInsertMode() == ITextEditorExtension3.SMART_INSERT;