diff --git a/include/my_global.h b/include/my_global.h
index e4e53aca20a..e284acce186 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -55,6 +55,10 @@
 #define USE_PRAGMA_INTERFACE
 #endif
 
+#if defined(__OpenBSD__) && (OpenBSD >= 200411)
+#define HAVE_ERRNO_AS_DEFINE
+#endif
+
 #if defined(i386) && !defined(__i386__)
 #define __i386__
 #endif