From 06563467b87a503ac2275c541b1d3ef0bb62abd6 Mon Sep 17 00:00:00 2001
From: Michael Snoyman <michael@snoyman.com>
Date: Thu, 22 Jan 2015 15:16:28 +0200
Subject: [PATCH] Upper bound for #424

---
 build-constraints.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5f0d7bf3..ade038c0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -719,6 +719,9 @@ packages:
         # https://github.com/fpco/stackage/issues/415
         - hackage-db < 1.12
 
+        # https://github.com/fpco/stackage/issues/424
+        - control-monad-free < 0.6
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: