diff --git a/.github/workflows/measure-size.yml b/.github/workflows/measure-size.yml
index 2c1c017a3..a67a7dd4a 100644
--- a/.github/workflows/measure-size.yml
+++ b/.github/workflows/measure-size.yml
@@ -4,6 +4,7 @@ on: ['pull_request']
 
 env:
   GO_VERSION: '~1.20.14'
+  GOPHERJS_EXPERIMENT: generics
 
 jobs:
   measure: