diff --git a/build-constraints.yaml b/build-constraints.yaml
index e4466c1c..b2673291 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8134,6 +8134,7 @@ expected-test-failures:
     - rocksdb-haskell-jprupp # 2.1.7 https://github.com/jprupp/rocksdb-haskell/issues/10
     - sandwich-webdriver # 0.3.0.1 needs Nix binary and store.
     - servant-auth-client # 0.4.2.0 https://github.com/haskell-servant/servant/issues/1864
+    - servant-prometheus # 1.3.0 https://github.com/ocharles/servant-prometheus/issues/17
     - subcategories # 0.2.1.2
     - sydtest # 0.20.0.0
     - sydtest-autodocodec # https://github.com/commercialhaskell/stackage/issues/7465