diff --git a/build-constraints.yaml b/build-constraints.yaml
index 38c5e656..31ee6da7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2453,6 +2453,9 @@ expected-test-failures:
     # https://github.com/twittner/wai-predicates/issues/2
     - wai-predicates
 
+    # https://github.com/creichert/wai-middleware-throttle/issues/4
+    - wai-middleware-throttle
+
 # end of expected-test-failures