diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0b5500d2..70cab47c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1273,6 +1273,9 @@ expected-test-failures:
     - hedis
     - redis-io
 
+    # https://github.com/yesodweb/Shelly.hs/issues/99
+    - shelly
+
 # Haddocks which are expected to fail. Same concept as expected test failures.
 expected-haddock-failures:
     # https://github.com/acw/bytestring-progress/issues/4