diff --git a/ipc/util.h b/ipc/util.h
index 1187332..f9fe90e 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -128,7 +128,7 @@
 struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
 				      struct ipc64_perm *perm, int extra_perm);
 
-#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
+#ifndef __ARCH_WANT_IPC_PARSE_VERSION
   /* On IA-64, we always use the "64-bit version" of the IPC structures.  */ 
 # define ipc_parse_version(cmd)	IPC_64
 #else