1 files changed, 2 insertions, 2 deletions
diff --git a/src/mongo/db/pipeline/expression.h b/src/mongo/db/pipeline/expression.h
index 46caaa5f821..dc9d5ab6ac3 100644
--- a/src/mongo/db/pipeline/expression.h
+++ b/src/mongo/db/pipeline/expression.h
@@ -134,12 +134,12 @@ namespace mongo {
          *
          * NOTE: Name validation is responsibility of caller.
          */
-        Variables::Id defineVariable(const StringData& name);
+        Variables::Id defineVariable(StringData name);
 
         /**
          * Returns the current Id for a variable. uasserts if the variable isn't defined.
          */
-        Variables::Id getVariable(const StringData& name) const;
+        Variables::Id getVariable(StringData name) const;
 
     private:
         StringMap<Variables::Id> _variables;