diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9205120a..36ef676c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2864,7 +2864,7 @@ packages:
         - Imlib
         - xturtle < 0 # GHC 8.4 via yjsvg
         - gluturtle < 0 # build failure with GHC 8.4
-        - papillon < 0
+        - papillon
         - exception-hierarchy < 0
         - simplest-sqlite < 0
         - warp-tls-uid