diff --git a/reactos/drivers/ksfilter/ks/filter.c b/reactos/drivers/ksfilter/ks/filter.c
index 36a40e0c56c..384a00c4031 100644
--- a/reactos/drivers/ksfilter/ks/filter.c
+++ b/reactos/drivers/ksfilter/ks/filter.c
@@ -877,7 +877,7 @@ KspHandleDataIntersection(
             break;
         }
 
-        DataRange =  UlongToPtr(PtrToUlong(DataRange) + DataRange->FormatSize);
+        DataRange = (PKSDATARANGE)((PUCHAR)DataRange + DataRange->FormatSize);
         /* FIXME make sure its 64 bit aligned */
         ASSERT(((ULONG_PTR)DataRange & 0x7) == 0);
     }