diff --git a/build-constraints.yaml b/build-constraints.yaml
index 27af3606..3a823456 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2704,7 +2704,7 @@ packages:
         - haskell-tools-demo
         - haskell-tools-cli
         - haskell-tools-daemon
-        # - haskell-tools-debug # https://github.com/haskell-tools/haskell-tools/issues/257
+        - haskell-tools-debug
 
     "David Fisher <ddf1991@gmail.com> @ddfisher":
         - socket-activation