diff --git a/lib/mix/ecto.ex b/lib/mix/ecto.ex
index 76a49ca3bc..b092f42a70 100644
--- a/lib/mix/ecto.ex
+++ b/lib/mix/ecto.ex
@@ -98,7 +98,7 @@ defmodule Mix.Ecto do
 
     {:ok, apps} = repo.__adapter__.ensure_all_started(repo, :temporary)
 
-    pool_size = Keyword.get(opts, :pool_size, 1)
+    pool_size = Keyword.get(opts, :pool_size, 2)
     case repo.start_link(pool_size: pool_size) do
       {:ok, pid} ->
         {:ok, pid, apps}
diff --git a/test/mix/ecto_test.exs b/test/mix/ecto_test.exs
index 99b555f20a..b3c7d4943d 100644
--- a/test/mix/ecto_test.exs
+++ b/test/mix/ecto_test.exs
@@ -21,7 +21,7 @@ defmodule Mix.EctoTest do
 
   defmodule Repo do
     def start_link(opts) do
-      assert opts[:pool_size] == 1
+      assert opts[:pool_size] == 2
       Process.get(:start_link)
     end