diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/c/hover/CSourceHover.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/c/hover/CSourceHover.java
index ebbc7b4dd6c..f8a2f7a1919 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/c/hover/CSourceHover.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/c/hover/CSourceHover.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2002, 2007 QNX Software Systems and others.
+ * Copyright (c) 2002, 2008 QNX Software Systems 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
@@ -756,7 +756,7 @@ public class CSourceHover extends AbstractCEditorTextHover implements ITextHover
 	private String searchInIndex(ITranslationUnit tUnit, IRegion textRegion) {
 		IProgressMonitor monitor= new NullProgressMonitor();
 		ComputeSourceRunnable computer= new ComputeSourceRunnable(tUnit, textRegion);
-		ASTProvider.getASTProvider().runOnAST(tUnit, ASTProvider.WAIT_ACTIVE_ONLY, monitor, computer);
+		ASTProvider.getASTProvider().runOnAST(tUnit, ASTProvider.WAIT_NO, monitor, computer);
 		return computer.getSource();
 	}