diff --git a/src/funcs.h b/src/funcs.h
index a0cda636..6a178dd7 100644
--- a/src/funcs.h
+++ b/src/funcs.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef FUNC_H
+#define FUNC_H
 
 typedef int int32_t;
 
@@ -10,4 +11,6 @@ void addNumbers(int32_t l, int32_t r);
 
 void someHeaderImplementedFunction(int32_t a, int32_t b) {
   doSomething(a, b);
-}
\ No newline at end of file
+}
+
+#endif // FUNC_H
\ No newline at end of file