diff --git a/build-constraints.yaml b/build-constraints.yaml
index 69016aab..d78875c7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3939,6 +3939,7 @@ expected-test-failures:
     - nettle # https://github.com/stbuehler/haskell-nettle/issues/8
     - pipes-misc # https://github.com/louispan/pipes-misc/issues/1
     - pixelated-avatar-generator # 0.1.3 https://github.com/ExcaliburZero/pixelated-avatar-generator/issues/19
+    - req # https://github.com/mrkkrp/req/issues/44
     - servant-elm # https://github.com/mattjbray/servant-elm/issues/38
     - shikensu # https://github.com/icidasset/shikensu/issues/5
     - unicode-show # https://github.com/nushio3/unicode-show/issues/2