diff --git a/lib/redis_failover/client.rb b/lib/redis_failover/client.rb
index bb9d600..f9ca9a7 100644
--- a/lib/redis_failover/client.rb
+++ b/lib/redis_failover/client.rb
@@ -277,7 +277,7 @@ def build_clients
     def should_notify?
       return false unless @on_node_change
       return true if @last_notified_master != current_master
-      return true if different?(@last_notified_slaves, current_slaves)
+      return true if different?(Array(@last_notified_slaves), current_slaves)
       false
     end