diff --git a/arch/nt32/bits/ipc.h b/arch/nt32/bits/ipc.h
index b748d3b..ac5d097 100644
--- a/arch/nt32/bits/ipc.h
+++ b/arch/nt32/bits/ipc.h
@@ -11,4 +11,4 @@ struct ipc_perm
 	long __pad2;
 };
 
-#define IPC_64 0x100
+#define IPC_64 0