diff --git a/build-constraints.yaml b/build-constraints.yaml
index 08077dab..1e18f24c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -307,6 +307,7 @@ packages:
         - monad-coroutine
         - incremental-parser
         - monoid-subclasses
+        - picoparsec
 
     "Brent Yorgey <byorgey@gmail.com>":
         - active