diff --git a/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb b/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
index 24fa8260a0d..509468d5475 100644
--- a/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
+++ b/lib/active_record/connection_adapters/postgresql_fallback_adapter.rb
@@ -57,7 +57,10 @@ class PostgreSQLFallbackHandler
   end
 
   def initiate_fallback_to_master
-    return unless @initialized
+    unless @initialized
+      @initialized = true
+      return
+    end
 
     @masters_down.hash.keys.each do |key|
       RailsMultisite::ConnectionManagement.with_connection(key) do