diff --git a/Test/TestParser.hs b/Test/TestParser.hs
index 7c38433..521a615 100644
--- a/Test/TestParser.hs
+++ b/Test/TestParser.hs
@@ -145,10 +145,10 @@ testExpressionPostDecrement = TestCase $
     assertEqual "expect PostDecrement" (StatementExpressionExpression $ PostDecrement (Reference "a")) $
     parseExpression [IDENTIFIER "a",DECREMENT]
 testExpressionPreIncrement = TestCase $
-    assertEqual "expect PreIncrement" (StatementExpressionExpression $ Assignment (Reference "a") (BinaryOperation Addition (IntegerLiteral 1) (Reference "a"))) $
+    assertEqual "expect PreIncrement" (StatementExpressionExpression $ PreIncrement (Reference "a")) $
     parseExpression [INCREMENT,IDENTIFIER "a"]
 testExpressionPreDecrement = TestCase $
-    assertEqual "expect PreIncrement" (StatementExpressionExpression $ Assignment (Reference "a") (BinaryOperation Subtraction (IntegerLiteral 1) (Reference "a"))) $
+    assertEqual "expect PreIncrement" (StatementExpressionExpression $ PreDecrement (Reference "a")) $
     parseExpression [DECREMENT,IDENTIFIER "a"]
 testExpressionAssign = TestCase $
     assertEqual "expect assign 5 to a" (StatementExpressionExpression (Assignment (Reference "a") (IntegerLiteral 5))) $
diff --git a/src/Parser/JavaParser.y b/src/Parser/JavaParser.y
index 5f19c34..fd694b6 100644
--- a/src/Parser/JavaParser.y
+++ b/src/Parser/JavaParser.y
@@ -279,9 +279,9 @@ assignmentoperator : ASSIGN { Nothing }
                  | XOREQUAL { Just BitwiseXor }
                  | OREQUAL{ Just BitwiseOr }
 
-preincrementexpression : INCREMENT unaryexpression { Assignment $2 (BinaryOperation Addition (IntegerLiteral 1) $2) }
+preincrementexpression : INCREMENT unaryexpression { PreIncrement $2 }
 
-predecrementexpression : DECREMENT unaryexpression { Assignment $2 (BinaryOperation Subtraction (IntegerLiteral 1) $2) }
+predecrementexpression : DECREMENT unaryexpression { PreDecrement $2 }
 
 postincrementexpression : postfixexpression INCREMENT { PostIncrement $1 }