diff --git a/scripts/add3prf.py b/scripts/add3prf.py
index ff25952..6f808ef 100755
--- a/scripts/add3prf.py
+++ b/scripts/add3prf.py
@@ -75,6 +75,7 @@
   identifier {{
     type: "Archive"
     value: "https://static.crates.io/crates/{name}/{name}-{version}.crate"
+    primary_source: true
   }}
   version: "{version}"
   {license_comment}license_type: {license_type}