diff --git a/build-constraints.yaml b/build-constraints.yaml
index 47f1dfa3..adbe3c3c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -886,7 +886,9 @@ expected-test-failures:
     - cautious-file
 
 # Haddocks which are expected to fail. Same concept as expected test failures.
-expected-haddock-failures: []
+expected-haddock-failures:
+    # https://github.com/acw/bytestring-progress/issues/4
+    - bytestring-progress
 
 # Benchmarks which should not be built. Note that Stackage does *not* generally
 # build benchmarks. The difference here will be whether dependencies for these