diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7c366b20..caedd62f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -763,7 +763,7 @@ packages:
         - pipes-extras
         - pipes-http
         - pipes-parse
-        # - pipes-concurrency # build failure with GHC 8.4 https://github.com/Gabriel439/Haskell-Pipes-Concurrency-Library/issues/47
+        - pipes-concurrency
         - pipes-safe
         - turtle
         - foldl