diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1ca4181c..c429ccfc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3837,6 +3837,9 @@ expected-test-failures:
     # https://github.com/beijaflor-io/haskell-language-dockerfile/issues/8
     - language-dockerfile
 
+    # https://github.com/kazu-yamamoto/word8/issues/5
+    - word8
+
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run