diff --git a/src/servers/registrar/Jamfile b/src/servers/registrar/Jamfile
index 26cfce01bd..a2e77cc990 100644
--- a/src/servers/registrar/Jamfile
+++ b/src/servers/registrar/Jamfile
@@ -62,7 +62,7 @@ Server registrar
 ;
 
 DoCatalogs registrar :
-	application/x-vnd.Haiku-Registrar
+	x-vnd.haiku-registrar
 	:
 	ShutdownProcess.cpp
 ;
diff --git a/src/servers/registrar/registrar.rdef b/src/servers/registrar/registrar.rdef
index 86045c0261..e77cda03f1 100644
--- a/src/servers/registrar/registrar.rdef
+++ b/src/servers/registrar/registrar.rdef
@@ -2,7 +2,7 @@
  * registrar.rdef
  */
 
-resource app_signature "application/x-vnd.Haiku-Registrar";
+resource app_signature "application/x-vnd.haiku-registrar";
 
 resource app_flags B_EXCLUSIVE_LAUNCH | B_BACKGROUND_APP;
 	/* the registrar's application flags are actually