2 files changed, 5 insertions, 3 deletions
diff --git a/lib/arel/tree_manager.rb b/lib/arel/tree_manager.rb
index 8a13345c91..077458fe18 100644
--- a/lib/arel/tree_manager.rb
+++ b/lib/arel/tree_manager.rb
@@ -15,7 +15,7 @@ module Arel
     end
 
     def to_sql
-      visitor.accept @head
+      @visitor.accept @head
     end
 
     def initialize_copy other
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index d1cb115238..69c7736a4b 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -9,8 +9,10 @@ module Arel
       end
 
       def accept object
-        @connection = @engine.connection
-        visit object
+        @engine.connection_pool.with_connection do |conn|
+          @connection = conn
+          visit object
+        end
       end
 
       private