diff --git a/presto-main/src/main/java/io/prestosql/sql/planner/optimizations/SymbolMapper.java b/presto-main/src/main/java/io/prestosql/sql/planner/optimizations/SymbolMapper.java
index 6c95d0a94b1df..169a600383805 100644
--- a/presto-main/src/main/java/io/prestosql/sql/planner/optimizations/SymbolMapper.java
+++ b/presto-main/src/main/java/io/prestosql/sql/planner/optimizations/SymbolMapper.java
@@ -65,7 +65,7 @@ public Symbol map(Symbol symbol)
         return canonical;
     }
 
-    public Expression map(Expression value)
+    public Expression map(Expression expression)
     {
         return ExpressionTreeRewriter.rewriteWith(new ExpressionRewriter<Void>()
         {
@@ -75,7 +75,7 @@ public Expression rewriteSymbolReference(SymbolReference node, Void context, Exp
                 Symbol canonical = map(Symbol.from(node));
                 return canonical.toSymbolReference();
             }
-        }, value);
+        }, expression);
     }
 
     public AggregationNode map(AggregationNode node, PlanNode source)