diff --git a/types.hh b/types.hh
old mode 100644
new mode 100755
index 1046d4b..589e271
--- a/types.hh
+++ b/types.hh
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef TYPES_HH
+#define TYPES_HH
 
 #include <cstdint>
 #include <string>
@@ -19,3 +20,4 @@ typedef void * any;
 
 using std::string;
 using std::vector;
+#endif // TYPES_HH
\ No newline at end of file