1 files changed, 5 insertions, 2 deletions
diff --git a/include/ocl/fix/checksum.hpp b/include/ocl/fix/checksum.hpp
index 204fc23..f124a08 100644
--- a/include/ocl/fix/checksum.hpp
+++ b/include/ocl/fix/checksum.hpp
@@ -5,10 +5,13 @@
  * Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
  */
 
-#pragma once
+#ifndef __OCL_FIX_CHECKSUM
+#define __OCL_FIX_CHECKSUM
 
 #include <ocl/fix/detail/config.hpp>
 
 namespace ocl::fix
 {
-}
-\ No newline at end of file
+}
+
+#endif 
+\ No newline at end of file