diff --git a/include/compat/sys/types.h b/include/compat/sys/types.h
index 1e9979f..e090b45 100644
--- a/include/compat/sys/types.h
+++ b/include/compat/sys/types.h
@@ -18,6 +18,8 @@
 
 #include <stdint.h>
 
+#include <sys/cdefs.h>
+
 #ifdef __MINGW32__
 #include <_bsd_types.h>
 #endif