diff --git a/reactos/dll/win32/msgina/msgina.spec b/reactos/dll/win32/msgina/msgina.spec
index 56619b161d7..3e23fb6a735 100644
--- a/reactos/dll/win32/msgina/msgina.spec
+++ b/reactos/dll/win32/msgina/msgina.spec
@@ -13,7 +13,7 @@
 13 stub -noname ShellStatusHostShuttingDown ; ()
 14 stub -noname ShellNotifyThemeUserChange  ; (long long)
 15 stub -noname ShellSwitchWhenInteractiveReady ; (long long)
-16 stub -noname ShellDimScreen ; (ptr ptr)
+16 stdcall -noname ShellDimScreen (ptr ptr)
 17 stub -noname ShellInstallAccountFilterData ; ()
 18 stub -noname ShellStatusHostBegin ; (long)
 19 stub -noname ShellIsUserInteractiveLogonAllowed ; (long)
diff --git a/reactos/dll/win32/msgina/stubs.c b/reactos/dll/win32/msgina/stubs.c
index b068ffe6d50..3a7b7a64055 100644
--- a/reactos/dll/win32/msgina/stubs.c
+++ b/reactos/dll/win32/msgina/stubs.c
@@ -117,3 +117,9 @@ WlxGetConsoleSwitchCredentials(
     return FALSE;
 }
 
+HRESULT WINAPI 
+ShellDimScreen (void* Unknown, HWND* hWindow)
+{
+    UNIMPLEMENTED;
+    return E_FAIL;
+}