diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0ca51246..ba72ac4b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3854,6 +3854,9 @@ expected-test-failures:
     # https://github.com/simonmichael/hledger/issues/596
     - hledger-lib
 
+    # https://github.com/romanb/wai-route/issues/5
+    - wai-route
+
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run