diff --git a/modules/gdscript/gd_parser.cpp b/modules/gdscript/gd_parser.cpp
index 4a199eb6a8f..e87bd99e4f2 100644
--- a/modules/gdscript/gd_parser.cpp
+++ b/modules/gdscript/gd_parser.cpp
@@ -514,6 +514,7 @@ GDParser::Node* GDParser::_parse_expression(Node *p_parent,bool p_static,bool p_
 		} else if (/*tokenizer->get_token()==GDTokenizer::TK_OP_ADD ||*/ tokenizer->get_token()==GDTokenizer::TK_OP_SUB || tokenizer->get_token()==GDTokenizer::TK_OP_NOT || tokenizer->get_token()==GDTokenizer::TK_OP_BIT_INVERT) {
 
 			//single prefix operators like !expr -expr ++expr --expr
+			alloc_node<OperatorNode>();
 			Expression e;
 			e.is_op=true;