diff --git a/build-constraints.yaml b/build-constraints.yaml
index afd97020..ae0d9d37 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1,6 +1,10 @@
 ghc-major-version: "7.10"
 # Constraints for brand new builds
 packages:
+    "Piotr Mlodawski @pmlodawski":
+        - signal
+        - ghc-session
+    
     "Michael Snoyman michael@snoyman.com @snoyberg":
         - bzlib-conduit
         - cabal-install