diff --git a/reactos/drivers/network/ndis/ndis/main.c b/reactos/drivers/network/ndis/ndis/main.c
index 04eb8c00f67..155e07522df 100644
--- a/reactos/drivers/network/ndis/ndis/main.c
+++ b/reactos/drivers/network/ndis/ndis/main.c
@@ -21,7 +21,7 @@ ULONG DebugTraceLevel = MIN_TRACE;
 
 #endif /* DBG */
 
-UCHAR CancelId;
+LONG CancelId;
 
 
 VOID NTAPI MainUnload(
diff --git a/reactos/drivers/network/ndis/ndis/misc.c b/reactos/drivers/network/ndis/ndis/misc.c
index be4cfdabd4a..3eb9d4d9c51 100644
--- a/reactos/drivers/network/ndis/ndis/misc.c
+++ b/reactos/drivers/network/ndis/ndis/misc.c
@@ -6,7 +6,7 @@
 
 #include "ndissys.h"
 
-extern UCHAR CancelId;
+extern LONG CancelId;
 
 /*
  * @implemented
@@ -522,7 +522,7 @@ NdisGeneratePartialCancelId(VOID)
 {
     UCHAR PartialCancelId;
 
-    PartialCancelId = InterlockedIncrement((PLONG)&CancelId);
+    PartialCancelId = (UCHAR)InterlockedIncrement(&CancelId);
 
     NDIS_DbgPrint(MAX_TRACE, ("Cancel ID %u\n", PartialCancelId));