diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/MappingSourceContainerDialog.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/MappingSourceContainerDialog.java
index 8e71d273554..03df52fdc0d 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/MappingSourceContainerDialog.java
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/sourcelookup/MappingSourceContainerDialog.java
@@ -58,6 +58,7 @@ import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
+import org.eclipse.swt.widgets.TableItem;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.PlatformUI;
 
@@ -119,7 +120,9 @@ public class MappingSourceContainerDialog extends TitleAreaDialog {
          */
         @Override
         protected Object openDialogBox( Control cellEditorWindow ) {
+            TableItem[] selection = ((Table)cellEditorWindow.getParent()).getSelection();
             DirectoryDialog dialog = new DirectoryDialog( cellEditorWindow.getShell() );
+            dialog.setFilterPath( selection[0].getText( 1 ) );
             return dialog.open();
         }
     }