diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index f1781f057c..e32154780a 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -176,7 +176,6 @@ module ActiveRecord
       deprecate :columns_hash
 
       def primary_keys
-        raise
         with_connection do |c|
           c.schema_cache.primary_keys
         end