diff --git a/reactos/sdk/include/psdk/ks.h b/reactos/sdk/include/psdk/ks.h
index 3ae6e9a3f23..173fee40e07 100644
--- a/reactos/sdk/include/psdk/ks.h
+++ b/reactos/sdk/include/psdk/ks.h
@@ -4113,6 +4113,13 @@ KsReadFile(
   _In_opt_ ULONG Key,
   _In_ KPROCESSOR_MODE RequestorMode);
 
+_IRQL_requires_max_(DISPATCH_LEVEL)
+KSDDKAPI
+VOID
+NTAPI
+KsReleaseDevice(
+  _In_ PKSDEVICE);
+
 _IRQL_requires_max_(DISPATCH_LEVEL)
 KSDDKAPI
 VOID