diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
index ca9fb11e95f60f2e9c941aa4bcbddc0fa6bdb785..7145dc069269b012b595de37982530bfde039375 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb
@@ -127,7 +127,7 @@ def self.establish_connection(spec = ENV["DATABASE_URL"])
       spec = resolver.spec
 
       unless respond_to?(spec.adapter_method)
-        raise AdapterNotFound, "database configuration specifies nonexistent #{spec[:adapter]} adapter"
+        raise AdapterNotFound, "database configuration specifies nonexistent #{spec.config[:adapter]} adapter"
       end
 
       remove_connection