diff --git a/src/rx/xdr_len.c b/src/rx/xdr_len.c
index 69fe3552d4..f226f54337 100644
--- a/src/rx/xdr_len.c
+++ b/src/rx/xdr_len.c
@@ -87,7 +87,7 @@ xdrlen_inline(AFS_XDRS_T axdrs, u_int len)
 }
 
 static struct xdr_ops xdrlen_ops = {
-#ifdef AFS_NT40_ENV
+#if defined(AFS_NT40_ENV) || (defined(AFS_SGI_ENV) && !defined(__c99))
     /* Windows does not support labeled assigments */
     xdrlen_getint32,    /* not supported */
     xdrlen_putint32,    /* serialize an afs_int32 */
diff --git a/src/rx/xdr_mem.c b/src/rx/xdr_mem.c
index 2608b2a072..483de0c5ab 100644
--- a/src/rx/xdr_mem.c
+++ b/src/rx/xdr_mem.c
@@ -61,7 +61,7 @@ static afs_int32 *xdrmem_inline(AFS_XDRS_T, u_int);
 static void xdrmem_destroy(AFS_XDRS_T);
 
 static struct xdr_ops xdrmem_ops = {
-#ifdef AFS_NT40_ENV
+#if defined(AFS_NT40_ENV) || (defined(AFS_SGI_ENV) && !defined(__c99))
     /* Windows does not support labeled assigments */
     xdrmem_getint32,    /* deserialize an afs_int32 */
     xdrmem_putint32,    /* serialize an afs_int32 */