diff --git a/reactos/dll/win32/setupapi/devinst.c b/reactos/dll/win32/setupapi/devinst.c
index e3272b4664d..900a7310aaf 100644
--- a/reactos/dll/win32/setupapi/devinst.c
+++ b/reactos/dll/win32/setupapi/devinst.c
@@ -3573,7 +3573,7 @@ HKEY WINAPI SetupDiOpenClassRegKeyExW(
                           samDesired,
                           &hClassesKey)))
         {
-            SetLastError(l);
+            SetLastError(ERROR_INVALID_CLASS);
             hClassesKey = INVALID_HANDLE_VALUE;
         }
         if (MachineName != NULL)