diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/CSourceNotFoundEditor.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/CSourceNotFoundEditor.java
index 00d1c6d2601..0071b6a367d 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/CSourceNotFoundEditor.java
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/CSourceNotFoundEditor.java
@@ -71,7 +71,7 @@ public class CSourceNotFoundEditor extends CommonSourceNotFoundEditor {
 	public static final String UID_LOCATE_FILE_BUTTON = UID_CLASS_NAME+ "locateFileButton"; //$NON-NLS-1$
 	public static final String UID_EDIT_LOOKUP_BUTTON = UID_CLASS_NAME+ "editLookupButton"; //$NON-NLS-1$
 		
-	private String missingFile;
+	private String missingFile = ""; //$NON-NLS-1$
 	private ILaunchConfiguration launch;
 	private IAdaptable context;
 	private ITranslationUnit tunit;