diff --git a/cde/lib/tt/lib/util/tt_xdr_utils.C b/cde/lib/tt/lib/util/tt_xdr_utils.C
index d43f9d9e9..76d716650 100644
--- a/cde/lib/tt/lib/util/tt_xdr_utils.C
+++ b/cde/lib/tt/lib/util/tt_xdr_utils.C
@@ -40,7 +40,7 @@
 #include <memory.h>
 #include "tt_options.h"
 
-#if defined(CSRG_BASED)
+#if defined(__OpenBSD__)
 #define XDR __rpc_xdr
 #endif