diff --git a/reactos/drivers/network/ndis/ndis.def b/reactos/drivers/network/ndis/ndis.def
index bdabe651f55..b5ca7c67035 100644
--- a/reactos/drivers/network/ndis/ndis.def
+++ b/reactos/drivers/network/ndis/ndis.def
@@ -257,6 +257,7 @@ NdisSetPacketCancelId@8
 NdisSetPacketPoolProtocolId@8
 ;NdisSetProtocolFilter ?
 NdisSetTimer@8
+NdisSetTimerEx@12
 NdisSetupDmaTransfer@24
 NdisSystemProcessorCount@0
 NdisTerminateWrapper@8
diff --git a/reactos/drivers/network/ndis/ndis/time.c b/reactos/drivers/network/ndis/ndis/time.c
index 1a9fb77ba33..26b454e0e3f 100644
--- a/reactos/drivers/network/ndis/ndis/time.c
+++ b/reactos/drivers/network/ndis/ndis/time.c
@@ -243,5 +243,26 @@ NdisSetTimer(
   KeSetTimer (&Timer->Timer, Timeout, &Timer->Dpc);
 }
 
+VOID
+EXPORT
+NdisSetTimerEx(
+    IN PNDIS_TIMER  Timer,
+    IN UINT  MillisecondsToDelay,
+    IN PVOID  FunctionContext)
+{
+#if 0
+    /* FIXME: I'm not sure how to this in a nice way
+     * We can't store the function context anywhere in NDIS_TIMER
+     * so I'm forced to do this
+     */
+
+    Timer->Dpc.DeferredContext = FunctionContext;
+
+    NdisSetTimer(Timer, MillisecondsToDelay);
+#else
+    UNIMPLEMENTED
+#endif
+}
+
 /* EOF */