diff --git a/src/cluster.c b/src/cluster.c
index b07cc4a3..7a53b471 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -47,6 +47,7 @@ clusterNode *clusterLookupNode(char *name);
 int clusterNodeAddSlave(clusterNode *master, clusterNode *slave);
 int clusterAddSlot(clusterNode *n, int slot);
 int clusterDelSlot(int slot);
+int clusterNodeSetSlotBit(clusterNode *n, int slot);
 
 /* -----------------------------------------------------------------------------
  * Initialization