diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/disassembly/editor/DisassemblyEditor.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/disassembly/editor/DisassemblyEditor.java
index 1b002f14674..8f508abfd37 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/disassembly/editor/DisassemblyEditor.java
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/internal/ui/disassembly/editor/DisassemblyEditor.java
@@ -111,6 +111,10 @@ public class DisassemblyEditor extends EditorPart implements ITextEditor, IReusa
             getSite().registerContextMenu( fDisassemblyPane.getViewContextMenuId(), fDisassemblyPane.getTextMenuManager(), getViewer() );
         }
         
+        if ( getSite() != null ) {
+            getSite().registerContextMenu( fDisassemblyPane.getRulerContextMenuId(), fDisassemblyPane.getTextMenuManager(), getViewer() );
+        }
+        
         VirtualSourceViewer viewer = fDisassemblyPane.getViewer();
         IEditorInput input = getEditorInput();
         if ( input instanceof DisassemblyEditorInput ) {