diff --git a/dlls/qwave/main.c b/dlls/qwave/main.c
index 685fcfb6c63..e256d1b8c6e 100644
--- a/dlls/qwave/main.c
+++ b/dlls/qwave/main.c
@@ -50,3 +50,11 @@ BOOL WINAPI QOSCreateHandle(PQOS_VERSION version, PHANDLE handle)
         SetLastError(ERROR_SERVICE_ALREADY_RUNNING);
     return FALSE;
 }
+
+BOOL WINAPI QOSAddSocketToFlow(HANDLE handle, SOCKET socket, PSOCKADDR addr,
+                               QOS_TRAFFIC_TYPE traffictype, DWORD flags, PQOS_FLOWID flowid)
+{
+    FIXME("%p, %lx, %p, %d, 0x%08x, %p stub!\n", handle, socket, addr, traffictype, flags, flowid);
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return FALSE;
+}
diff --git a/dlls/qwave/qwave.spec b/dlls/qwave/qwave.spec
index 94b62eb1d85..83dfc6787cc 100644
--- a/dlls/qwave/qwave.spec
+++ b/dlls/qwave/qwave.spec
@@ -1,6 +1,6 @@
 @ stub QDLHPathDiagnostics
 @ stub QDLHStartDiagnosingPath
-@ stub QOSAddSocketToFlow
+@ stdcall QOSAddSocketToFlow(ptr long ptr long long ptr)
 @ stub QOSCancel
 @ stub QOSCloseHandle
 @ stdcall QOSCreateHandle(ptr ptr)