diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1070803e..08077dab 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -121,8 +121,7 @@ packages:
     "Omari Norman <omari@smileystation.com>":
         - barecheck
         - rainbow
-        # https://github.com/fpco/stackage/issues/421
-        #- rainbow-tests
+        - rainbow-tests
         - quickpull
 
     "Neil Mitchell":