diff --git a/include/ddk/ntifs.h b/include/ddk/ntifs.h
index c7e51ab8d53..48e1d069aae 100644
--- a/include/ddk/ntifs.h
+++ b/include/ddk/ntifs.h
@@ -5636,6 +5636,7 @@ PsDereferencePrimaryToken(
 
 NTKERNELAPI
 VOID
+NTAPI
 PsDereferenceImpersonationToken(
   IN PACCESS_TOKEN ImpersonationToken);