diff --git a/ntoskrnl/include/internal/io.h b/ntoskrnl/include/internal/io.h
index 5835c66aa31..8ae32a0dc5c 100644
--- a/ntoskrnl/include/internal/io.h
+++ b/ntoskrnl/include/internal/io.h
@@ -527,7 +527,7 @@ typedef struct _RESERVE_IRP_ALLOCATOR
 } RESERVE_IRP_ALLOCATOR, *PRESERVE_IRP_ALLOCATOR;
 
 //
-//
+// Type selection for IopCreateSecurityDescriptorPerType()
 //
 typedef enum _SECURITY_DESCRIPTOR_TYPE
 {
diff --git a/ntoskrnl/io/iomgr/device.c b/ntoskrnl/io/iomgr/device.c
index 7d17ce95516..3810dd587c4 100644
--- a/ntoskrnl/io/iomgr/device.c
+++ b/ntoskrnl/io/iomgr/device.c
@@ -727,7 +727,7 @@ IopVerifyDeviceObjectOnStack(IN PDEVICE_OBJECT BaseDeviceObject,
 NTSTATUS
 NTAPI
 IopCreateSecurityDescriptorPerType(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
-                                   IN ULONG Type,
+                                   IN SECURITY_DESCRIPTOR_TYPE Type,
                                    OUT PULONG OutputFlags)
 {
     PACL Dacl;