1 files changed, 5 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
index 3e67c3a2b7..8491d42b86 100644
--- a/activerecord/lib/active_record/connection_adapters/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
@@ -3,10 +3,14 @@ module ActiveRecord
     class ConnectionSpecification #:nodoc:
       attr_reader :config, :adapter_method
 
-      def initialize (config, adapter_method)
+      def initialize(config, adapter_method)
         @config, @adapter_method = config, adapter_method
       end
 
+      def initialize_dup(original)
+        @config = original.config.dup
+      end
+
       ##
       # Builds a ConnectionSpecification from user input
       class Resolver # :nodoc: