diff --git a/build-constraints.yaml b/build-constraints.yaml
index 08077dab..a9c5f7b6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -307,7 +307,8 @@ packages:
         - monad-coroutine
         - incremental-parser
         - monoid-subclasses
-
+        - picoparsec
+        
     "Brent Yorgey <byorgey@gmail.com>":
         - active
         - BlogLiterately