diff --git a/build-constraints.yaml b/build-constraints.yaml
index 29d01f93..104d3b01 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3581,6 +3581,7 @@ expected-test-failures:
     - wai-middleware-content-type # 0.4.1 - https://github.com/athanclark/wai-middleware-content-type/issues/2
     - xmlgen # https://github.com/skogsbaer/xmlgen/issues/6
     - yesod-auth-basic # https://github.com/creichert/yesod-auth-basic/issues/1
+    - soap # https://bitbucket.org/dpwiz/haskell-soap/issues/5/tests-fail-to-build
 
     # Stackage upper bounds, re-enable these when their upper bound is removed
     - lens # doctest failure in 4.15.1, fixed in 4.15.2 but lens has an upper bound