diff --git a/reactos/dll/win32/setupapi/devclass.c b/reactos/dll/win32/setupapi/devclass.c
index a8a9b666c77..1e2a734320b 100644
--- a/reactos/dll/win32/setupapi/devclass.c
+++ b/reactos/dll/win32/setupapi/devclass.c
@@ -552,6 +552,9 @@ cleanup:
     if (hKey != INVALID_HANDLE_VALUE)
         RegCloseKey(hKey);
 
+    if (Buffer && !ret)
+        MyFree(Buffer);
+
     return ret;
 }