diff --git a/reactos/drivers/network/ndis/ndis/main.c b/reactos/drivers/network/ndis/ndis/main.c
index a226c69ffe2..04eb8c00f67 100644
--- a/reactos/drivers/network/ndis/ndis/main.c
+++ b/reactos/drivers/network/ndis/ndis/main.c
@@ -21,6 +21,8 @@ ULONG DebugTraceLevel = MIN_TRACE;
 
 #endif /* DBG */
 
+UCHAR CancelId;
+
 
 VOID NTAPI MainUnload(
     PDRIVER_OBJECT DriverObject)
@@ -61,6 +63,8 @@ DriverEntry(
 
   DriverObject->DriverUnload = MainUnload;
 
+  CancelId = 0;
+
   return STATUS_SUCCESS;
 }
 
diff --git a/reactos/drivers/network/ndis/ndis/misc.c b/reactos/drivers/network/ndis/ndis/misc.c
index c23707b94ad..be4cfdabd4a 100644
--- a/reactos/drivers/network/ndis/ndis/misc.c
+++ b/reactos/drivers/network/ndis/ndis/misc.c
@@ -6,6 +6,8 @@
 
 #include "ndissys.h"
 
+extern UCHAR CancelId;
+
 /*
  * @implemented
  */
@@ -518,13 +520,13 @@ UCHAR
 EXPORT
 NdisGeneratePartialCancelId(VOID)
 {
-    static UCHAR CancelId = 0;
+    UCHAR PartialCancelId;
 
-    CancelId++;
+    PartialCancelId = InterlockedIncrement((PLONG)&CancelId);
 
-    NDIS_DbgPrint(MAX_TRACE, ("Cancel ID %u\n", CancelId));
+    NDIS_DbgPrint(MAX_TRACE, ("Cancel ID %u\n", PartialCancelId));
 
-    return CancelId;
+    return PartialCancelId;
 }
 
 /* EOF */