diff --git a/src/bin/screenmode/screenmode.rdef b/src/bin/screenmode/screenmode.rdef
index 023ec6ba57..4e55805c84 100644
--- a/src/bin/screenmode/screenmode.rdef
+++ b/src/bin/screenmode/screenmode.rdef
@@ -1,3 +1,3 @@
-resource app_signature "application/x-vnd.haiku.screenmode";
+resource app_signature "application/x-vnd.Haiku.screenmode";
 
 resource app_flags B_MULTIPLE_LAUNCH | B_BACKGROUND_APP;