diff --git a/include/inja/parser.hpp b/include/inja/parser.hpp
index 909fd6e..6441910 100644
--- a/include/inja/parser.hpp
+++ b/include/inja/parser.hpp
@@ -139,14 +139,14 @@ class Parser {
             add_json_literal(tmpl.content.c_str());
           }
 
+	// Operator
+        } else if (tok.text == "and" || tok.text == "or" || tok.text == "in" || tok.text == "not") {
+          goto parse_operator;
+
         // Functions
         } else if (peek_tok.kind == Token::Kind::LeftParen) {
           operator_stack.emplace(std::make_shared<FunctionNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str()));
-          function_stack.emplace(operator_stack.top().get(), current_paren_level);
-
-        // Operator
-        } else if (tok.text == "and" || tok.text == "or" || tok.text == "in" || tok.text == "not") {
-          goto parse_operator;
+          function_stack.emplace(operator_stack.top().get(), current_paren_level);       
 
         // Variables
         } else {
diff --git a/single_include/inja/inja.hpp b/single_include/inja/inja.hpp
index 32b90b0..b9ccd7c 100644
--- a/single_include/inja/inja.hpp
+++ b/single_include/inja/inja.hpp
@@ -2835,14 +2835,14 @@ class Parser {
             add_json_literal(tmpl.content.c_str());
           }
 
+	// Operator
+        } else if (tok.text == "and" || tok.text == "or" || tok.text == "in" || tok.text == "not") {
+          goto parse_operator;
+
         // Functions
         } else if (peek_tok.kind == Token::Kind::LeftParen) {
           operator_stack.emplace(std::make_shared<FunctionNode>(static_cast<std::string>(tok.text), tok.text.data() - tmpl.content.c_str()));
-          function_stack.emplace(operator_stack.top().get(), current_paren_level);
-
-        // Operator
-        } else if (tok.text == "and" || tok.text == "or" || tok.text == "in" || tok.text == "not") {
-          goto parse_operator;
+          function_stack.emplace(operator_stack.top().get(), current_paren_level);       
 
         // Variables
         } else {
diff --git a/test/test-functions.cpp b/test/test-functions.cpp
index e42ede3..d339e4c 100644
--- a/test/test-functions.cpp
+++ b/test/test-functions.cpp
@@ -268,4 +268,7 @@ TEST_CASE("combinations") {
   CHECK(env.render("{{ last(list_of_objects).d * 2}}", data) == "10");
   CHECK(env.render("{{ last(range(5)) * 2 }}", data) == "8");
   CHECK(env.render("{{ last(range(5 * 2)) }}", data) == "9");
+  CHECK(env.render("{{ not true }}", data) == "false");
+  CHECK(env.render("{{ not (true) }}", data) == "false");
+  CHECK(env.render("{{ true or (true or true) }}", data) == "true");
 }