diff --git a/build-constraints.yaml b/build-constraints.yaml
index a1343e23..e60e5be9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4049,3 +4049,5 @@ non-parallel-builds:
 - pandoc
 - gogol-dfareporting
 - gogol-compute
+- idris
+- amazonka-ec2