diff --git a/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb b/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
index 5dc5f2278ec..af45125adc2 100644
--- a/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
+++ b/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
@@ -7,7 +7,7 @@ class PostgreSQLFallbackHandler
   include Singleton
 
   def initialize
-    @masters_down = {}
+    @masters_down = DistributedCache.new('masters_down')
     @mutex = Mutex.new
   end