diff --git a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
index cbc09dfc3b3d2d93503ff6f723c709562a8d0c7d..6ec023f0e5aecaa4897188b87b9fa55ac3fedcce 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
@@ -59,14 +59,13 @@ def select_all(sql, name = nil, binds = [])
 
       private
         def cache_sql(sql, binds)
-          key = [sql, binds]
           result =
-            if @query_cache.has_key?(key)
+            if @query_cache[sql].key?(binds)
               ActiveSupport::Notifications.instrument("sql.active_record",
                 :sql => sql, :name => "CACHE", :connection_id => self.object_id)
-              @query_cache[key]
+              @query_cache[sql][binds]
             else
-              @query_cache[key] = yield
+              @query_cache[sql][binds] = yield
             end
 
           if Array === result
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 42d6f2bb21937e45930d2d5438572a9ec2754d7d..f3fba9a3a96d9f05858fdfdd08f4e8d756c2939c 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -41,7 +41,7 @@ def initialize(connection, logger = nil) #:nodoc:
         @active = nil
         @connection, @logger = connection, logger
         @query_cache_enabled = false
-        @query_cache = {}
+        @query_cache = Hash.new { |h,sql| h[sql] = {} }
         @instrumenter = ActiveSupport::Notifications.instrumenter
       end