diff --git a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/variable/VariableCellModifier.java b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/variable/VariableCellModifier.java
index 5948872679e..dc61745caee 100644
--- a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/variable/VariableCellModifier.java
+++ b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/variable/VariableCellModifier.java
@@ -9,6 +9,7 @@ package org.eclipse.dd.dsf.debug.ui.viewmodel.variable;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.dd.dsf.debug.service.IFormattedValues;
 import org.eclipse.dd.dsf.debug.service.IExpressions.IExpressionDMContext;
+import org.eclipse.dd.dsf.debug.service.IExpressions.IExpressionDMData;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.IDebugVMConstants;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.expression.WatchExpressionCellModifier;
 import org.eclipse.dd.dsf.debug.ui.viewmodel.numberformat.IFormattedValuePreferenceStore;
@@ -53,6 +54,10 @@ public class VariableCellModifier extends WatchExpressionCellModifier {
             if (getVariableDMC(element) == null)
                 return false;
             
+           IExpressionDMData exprData = fDataAccess.readVariable(element);
+            
+            if ( ( exprData != null ) && ( ! exprData.isEditable() ) ) return false;
+ 
             return true ;
         }
 
diff --git a/plugins/org.eclipse.dd.dsf.debug/src/org/eclipse/dd/dsf/debug/service/IExpressions.java b/plugins/org.eclipse.dd.dsf.debug/src/org/eclipse/dd/dsf/debug/service/IExpressions.java
index 4158552a8c9..9919384dbb3 100644
--- a/plugins/org.eclipse.dd.dsf.debug/src/org/eclipse/dd/dsf/debug/service/IExpressions.java
+++ b/plugins/org.eclipse.dd.dsf.debug/src/org/eclipse/dd/dsf/debug/service/IExpressions.java
@@ -122,6 +122,11 @@ public interface IExpressions extends IFormattedValues {
          * This method needs to be defined.
          */
         IRegisters.IRegisterDMContext getRegister();
+        
+        /**
+         * @return True if this expression's value can be edited.  False otherwise.
+         */
+        boolean isEditable();
     }
 
     /**