diff --git a/toolmanifest_runtime.vdf b/toolmanifest_runtime.vdf
index 0b8490e6..a5d0356c 100644
--- a/toolmanifest_runtime.vdf
+++ b/toolmanifest_runtime.vdf
@@ -4,4 +4,5 @@
   "commandline" "/proton %verb%"
   "require_tool_appid" "1391110"
   "use_sessions" "1"
+  "compatmanager_layer_name" "proton"
 }