diff --git a/dbus/dbus-sysdeps-unix.c b/dbus/dbus-sysdeps-unix.c
index 18b4967b..3f963bca 100644
--- a/dbus/dbus-sysdeps-unix.c
+++ b/dbus/dbus-sysdeps-unix.c
@@ -79,8 +79,8 @@
 #define O_BINARY 0
 #endif
 
-#ifndef _AI_ADDRCONFIG
-#define _AI_ADDRCONFIG 0
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0
 #endif
 
 #ifndef HAVE_SOCKLEN_T