diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3539b1ba..5466dee3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3994,6 +3994,7 @@ expected-benchmark-failures:
     - xxhash # https://github.com/christian-marie/xxhash/issues/4
     - monad-memo # https://github.com/EduardSergeev/monad-memo/issues/3
     - ip # https://github.com/andrewthad/haskell-ip/issues/22
+    - cmark-gfm # https://github.com/kivikakk/cmark-gfm-hs/issues/5
 
 # end of expected-benchmark-failures