diff --git a/build-constraints.yaml b/build-constraints.yaml
index b05f61e5..dabd093c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3958,3 +3958,8 @@ no-revisions:
 - cryptonite
 - foundation
 - gauge
+
+# Do not build these packages in parallel with others. Useful for high memory
+# usage.
+non-parallel-builds:
+- pandoc