diff --git a/expression.c b/expression.c
index 43d0ac6..cf3e8b9 100644
--- a/expression.c
+++ b/expression.c
@@ -1075,11 +1075,13 @@ void ExpressionInfixOperator(struct ParseState *Parser,
             ResultInt = BottomInt >= TopInt;
             break;
         case TokenShiftLeft:
-            //ResultInt = BottomInt << TopInt;
+            ResultInt = BottomInt << TopInt;
+            /*
             if (BottomValue->Typ->Base == TypeUnsignedInt || BottomValue->Typ->Base == TypeUnsignedLong)
                 ResultInt = (uint64_t) BottomInt >> TopInt;
             else
                 ResultInt = BottomInt >> TopInt; 
+            */
             break;
         case TokenShiftRight:
             ResultInt = BottomInt >> TopInt;