diff --git a/.github/workflows/size.yml b/.github/workflows/size.yml
index fe635bda..7fe57cd1 100644
--- a/.github/workflows/size.yml
+++ b/.github/workflows/size.yml
@@ -1,7 +1,7 @@
 name: size
 on:
   # this action will error unless run in a pr context
-  pull_request:
+  pull_request_target:
     branches:
       - main