diff --git a/ports/cpp/source/antlr4-c3/CodeCompletionCore.hpp b/ports/cpp/source/antlr4-c3/CodeCompletionCore.hpp
index 3409392..ace0521 100644
--- a/ports/cpp/source/antlr4-c3/CodeCompletionCore.hpp
+++ b/ports/cpp/source/antlr4-c3/CodeCompletionCore.hpp
@@ -5,8 +5,7 @@
 //  Licensed under the MIT License.
 //
 
-#ifndef CODE_COMPLETION_CORE_HPP
-#define CODE_COMPLETION_CORE_HPP
+#pragma once
 
 #include <Parser.h>
 #include <ParserRuleContext.h>
@@ -247,4 +246,3 @@ class CodeCompletionCore {
 
 }  // namespace c3
 
-#endif /* CodeCompletionCore_hpp */