diff --git a/include/zinnia/guid.h b/include/zinnia/guid.h
index 9b1d2f0..d8fb0eb 100644
--- a/include/zinnia/guid.h
+++ b/include/zinnia/guid.h
@@ -1,9 +1,10 @@
 #pragma once
 
+#include <zinnia/compiler.h>
 #include <stddef.h>
 #include <stdint.h>
 
-struct [[gnu::packed]] guid {
+struct [[__packed]] guid {
     uint32_t time_low;
     uint16_t time_mid;
     uint16_t time_hi_version;