diff --git a/build-constraints.yaml b/build-constraints.yaml
index bd43a148..44e7cb89 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3874,6 +3874,9 @@ expected-test-failures:
     # Requires running PostgreSQL server
     - dbcleaner
 
+    # https://github.com/takano-akio/filelock/issues/4
+    - filelock
+
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run