diff --git a/projects/facebook.com/mvfst/package.yml b/projects/facebook.com/mvfst/package.yml
index 3b6bbfa3..10fa93ae 100644
--- a/projects/facebook.com/mvfst/package.yml
+++ b/projects/facebook.com/mvfst/package.yml
@@ -90,7 +90,7 @@ test:
       if: linux
 
     # Find a free port
-    - PORT=$(pkgx get-port)
+    - PORT=$(pkgx get-port | tail -n1)
 
     - ./echo --mode server --port $PORT -use_datagrams=true &
     - sleep 5