diff --git a/src/servers/app/app_server.rdef b/src/servers/app/app_server.rdef
index c4185f6a94..c283213469 100644
--- a/src/servers/app/app_server.rdef
+++ b/src/servers/app/app_server.rdef
@@ -2,7 +2,7 @@
  * app_server.rdef
  */
 
-resource app_signature "application/x-vnd.Haiku-app-server";
+resource app_signature "application/x-vnd.Haiku-app_server";
 
 resource app_flags B_EXCLUSIVE_LAUNCH | B_BACKGROUND_APP;