diff --git a/dlls/netio.sys/netio.c b/dlls/netio.sys/netio.c
index 6a8a002ebef..ef4089c68e0 100644
--- a/dlls/netio.sys/netio.c
+++ b/dlls/netio.sys/netio.c
@@ -41,6 +41,11 @@ NTSTATUS WINAPI WskRegister(WSK_CLIENT_NPI *wsk_client_npi, WSK_REGISTRATION *ws
     return STATUS_NOT_IMPLEMENTED;
 }
 
+void WINAPI WskDeregister(WSK_REGISTRATION *wsk_registration)
+{
+    FIXME("wsk_registration %p stub.\n", wsk_registration);
+}
+
 static void WINAPI driver_unload(DRIVER_OBJECT *driver)
 {
     TRACE("driver %p.\n", driver);
diff --git a/dlls/netio.sys/netio.sys.spec b/dlls/netio.sys/netio.sys.spec
index d886ab8db9e..915259c6f4d 100644
--- a/dlls/netio.sys/netio.sys.spec
+++ b/dlls/netio.sys/netio.sys.spec
@@ -385,7 +385,7 @@
 @ stub WfpStreamIsFilterPresent
 @ stub WfpUninitializeLeastRecentlyUsedList
 @ stub WskCaptureProviderNPI
-@ stub WskDeregister
+@ stdcall WskDeregister(ptr)
 @ stub WskQueryProviderCharacteristics
 @ stdcall WskRegister(ptr ptr)
 @ stub WskReleaseProviderNPI
diff --git a/include/ddk/wsk.h b/include/ddk/wsk.h
index 835adbba9dc..e990d054bd7 100644
--- a/include/ddk/wsk.h
+++ b/include/ddk/wsk.h
@@ -111,6 +111,7 @@ typedef struct _WSK_PROVIDER_NPI
 } WSK_PROVIDER_NPI, *PWSK_PROVIDER_NPI;
 
 NTSTATUS WINAPI WskRegister(WSK_CLIENT_NPI *wsk_client_npi, WSK_REGISTRATION *wsk_registration);
+void WINAPI WskDeregister(WSK_REGISTRATION *wsk_registration);
 
 #ifdef __cplusplus
 }