diff --git a/daemons/clvmd/clvmd-comms.h b/daemons/clvmd/clvmd-comms.h
index 715244cb7..fbcfe8b54 100644
--- a/daemons/clvmd/clvmd-comms.h
+++ b/daemons/clvmd/clvmd-comms.h
@@ -112,9 +112,13 @@ struct cluster_ops *init_corosync_cluster(void);
 
 #ifdef USE_SINGLENODE
 #  define SINGLENODE_CSID_LEN (sizeof(int))
-#  define MAX_CLUSTER_MEMBER_NAME_LEN       64
+#  ifndef MAX_CLUSTER_MEMBER_NAME_LEN
+#    define MAX_CLUSTER_MEMBER_NAME_LEN       64
+#  endif
 #  define SINGLENODE_MAX_CLUSTER_MESSAGE          65535
-#  define MAX_CSID_LEN sizeof(int)
+#  ifndef MAX_CSID_LEN
+#    define MAX_CSID_LEN sizeof(int)
+#  endif
 struct cluster_ops *init_singlenode_cluster(void);
 #endif