diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3b0a1d0e..557749e2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -49,6 +49,7 @@ packages:
         - binary-conduit
         - lzma-conduit
         - mutable-containers
+        - hpc-coveralls
 
     "FP Complete michael@fpcomplete.com @snoyberg":
         - alex
@@ -774,6 +775,9 @@ skipped-tests:
     # https://github.com/fpco/stackage/pull/380#issuecomment-68060871
     - Rasterific
 
+    # https://github.com/Soostone/retry/issues/18
+    - retry
+
 # Tests which we should build and run, but which are expected to fail. We
 # should not fail a build based on a test failure for one of these packages.
 expected-test-failures: