diff --git a/build-constraints.yaml b/build-constraints.yaml
index 435a550a..6ca3e43c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -10,7 +10,7 @@ cabal-format-version: "2.4"
 # Constraints for brand new builds
 packages:
     "Geoffrey Mainland <mainland@drexel.edu> @mainland":
-        - exception-mtl[B
+        - exception-mtl
         - exception-transformers
         - mainland-pretty
         - ref-fd