diff --git a/scripts/run_locally.js b/scripts/run_locally.js
index 41092e3d8837d67af5020b3197a74cd9f23fbb59..b5670b35839e2f68aa422541b9b893a46b9ce7bc 100755
--- a/scripts/run_locally.js
+++ b/scripts/run_locally.js
@@ -54,7 +54,8 @@ process.env['HTTP_PROXY'] = HOST + ":10006";
 
 // all spawned process that use handle primaries should know about "shimmed"
 // primaries
-process.env['SHIMMED_PRIMARIES'] = "example.domain|http://" + HOST + ":10005|" + path.join(__dirname, "..", "example", "primary", ".well-known", "browserid");
+var oldShims = process.env['SHIMMED_PRIMARIES'] ? process.env['SHIMMED_PRIMARIES'] + "," : "";
+process.env['SHIMMED_PRIMARIES'] = oldShims + "example.domain|http://" + HOST + ":10005|" + path.join(__dirname, "..", "example", "primary", ".well-known", "browserid");
 
 // all spawned processes should log to console
 process.env['LOG_TO_CONSOLE'] = 1;