diff --git a/build-constraints.yaml b/build-constraints.yaml
index a14b9787..dfdfce3f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3747,6 +3747,7 @@ expected-test-failures:
     - bitx-bitcoin  # https://github.com/tebello-thejane/bitx.hs/issues/4
     - http-link-header  # https://github.com/myfreeweb/http-link-header/issues/7
     - aeson-typescript  # https://github.com/codedownio/aeson-typescript/issues/2
+    - courier  # https://github.com/hargettp/courier/issues/19
 
     # Compilation failures
     - yeshql # https://bitbucket.org/tdammers/yeshql/issues/1/stackage-nightly-test-failure