diff --git a/Tools/package_server_build.py b/Tools/package_server_build.py
index 32a61722f6..4c5c03d3e6 100755
--- a/Tools/package_server_build.py
+++ b/Tools/package_server_build.py
@@ -71,6 +71,7 @@ SERVER_CONTENT_ASSEMBLIES = [
 SERVER_EXTRA_ASSEMBLIES = [
     "Npgsql.",
     "Microsoft",
+    "System.Linq.Async",
 ]
 
 SERVER_NOT_EXTRA_ASSEMBLIES = [