diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7a74c545..81cec812 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -57,6 +57,7 @@ packages:
         - experimenter
         - api-maker
         - easy-logger
+        - welford-online-mean-variance
 
     "Kamil Dworakowski <kamil@dworakowski.name> @luntain":
         - error-or