diff --git a/host/src/app.c b/host/src/app.c
index 81d7f311..a6c3667e 100644
--- a/host/src/app.c
+++ b/host/src/app.c
@@ -629,7 +629,7 @@ static bool newKVMFRData(KVMFRUserData * dst)
     record->size = sizeof(*osInfo);
 
     osInfo->os = KVMFR_OS_OTHER;
-    if (!appendBuffer(dst, record, "Unknown", 9))
+    if (!appendBuffer(dst, record, "Unknown\0", 9))
       return false;
   }