diff --git a/build-constraints.yaml b/build-constraints.yaml
index 53d11ce9..51357a0c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4068,6 +4068,7 @@ expected-test-failures:
     - wreq
     - http-client # https://github.com/snoyberg/http-client/issues/360
     - http-client-tls # https://github.com/snoyberg/http-client/issues/360
+    - req # https://github.com/mrkkrp/req/issues/46
 
     # Compilation failures
     - yeshql # https://bitbucket.org/tdammers/yeshql/issues/1/stackage-nightly-test-failure