diff --git a/interpreter/src/Lexer.cpp b/interpreter/src/Lexer.cpp
index 72b2ce2..50d2005 100644
--- a/interpreter/src/Lexer.cpp
+++ b/interpreter/src/Lexer.cpp
@@ -192,11 +192,17 @@ Token Lexer::id()
     std::string result;
     std::map<std::string, Token> RESERVED_KEYWORDS = getReservedKeywords();
 
-    while (_currentChar != '\0' && (isalnum(_currentChar) || _currentChar == '(' || _currentChar == ')')) {
+    while (_currentChar != '\0' && isalnum(_currentChar)) {
         result += _currentChar;
         advance();
     }
 
+    if (_currentChar == '(' && peekNextChar() == ')') {
+        result += "()";
+        advance();
+        advance();
+    }
+
     if (RESERVED_KEYWORDS.count(result)) {
         return RESERVED_KEYWORDS.at(result);
     } else {