diff --git a/src/GraphingImpl/Mocks/Graph.h b/src/GraphingImpl/Mocks/Graph.h
index 3678074c..00335037 100644
--- a/src/GraphingImpl/Mocks/Graph.h
+++ b/src/GraphingImpl/Mocks/Graph.h
@@ -44,7 +44,7 @@ namespace MockGraphingImpl
             return m_variables;
         }
 
-        virtual void SetArgValue(std::wstring variableName, double /*value*/)
+        virtual void SetArgValue(std::wstring /*variableName*/, double /*value*/)
         {
         }