diff --git a/servers/rendering/shader_language.cpp b/servers/rendering/shader_language.cpp
index 356f6e77d5..d663150706 100644
--- a/servers/rendering/shader_language.cpp
+++ b/servers/rendering/shader_language.cpp
@@ -7753,6 +7753,7 @@ ShaderLanguage::Node *ShaderLanguage::_parse_expression(BlockNode *p_block, cons
 					_set_error(vformat(RTR("Invalid arguments to unary operator '%s': %s."), get_operator_text(op->op), at));
 					return nullptr;
 				}
+				expression.write[i].node = _reduce_expression(p_block, expression.write[i].node);
 				expression.remove_at(i + 1);
 			}