diff --git a/headers/private/app/RosterPrivate.h b/headers/private/app/RosterPrivate.h
index 5ad11f6d8b..3600f55323 100644
--- a/headers/private/app/RosterPrivate.h
+++ b/headers/private/app/RosterPrivate.h
@@ -13,7 +13,7 @@
 #include <Roster.h>
 
 
-const int32 kMsgAppServerStarted = '_ASt';
+const uint32 kMsgAppServerStarted = '_ASt';
 
 
 class BRoster::Private {