diff --git a/parser.go b/parser.go
index d0478a2..ac46991 100644
--- a/parser.go
+++ b/parser.go
@@ -615,7 +615,7 @@ func (p *Parser) tryUnaryExpression() (*Expression, error) {
 		}
 	}
 
-	return nil, nil
+	return p.tryPrimaryExpression()
 }
 
 func (p *Parser) tryBinaryExpression0(opFunc func() (*Expression, error), operators ...Operator) (*Expression, error) {
@@ -652,7 +652,7 @@ func (p *Parser) tryBinaryExpression0(opFunc func() (*Expression, error), operat
 }
 
 func (p *Parser) tryMultiplicativeExpression() (*Expression, error) {
-	return p.tryBinaryExpression0(p.tryPrimaryExpression, Operator_Multiply, Operator_Divide, Operator_Modulo)
+	return p.tryBinaryExpression0(p.tryUnaryExpression, Operator_Multiply, Operator_Divide, Operator_Modulo)
 }
 
 func (p *Parser) tryAdditiveExpression() (*Expression, error) {