diff --git a/include/winerror.h b/include/winerror.h
index 6eb6822..bc8521e 100644
--- a/include/winerror.h
+++ b/include/winerror.h
@@ -707,6 +707,7 @@
 #define ERROR_INVALID_COMMAND_LINE                         1639
 #define ERROR_INSTALL_REMOTE_DISALLOWED                    1640
 #define ERROR_SUCCESS_REBOOT_INITIATED                     1641
+#define ERROR_UNKNOWN_PATCH                                1647
 #define RPC_S_INVALID_STRING_BINDING                       1700
 #define RPC_S_WRONG_KIND_OF_BINDING                        1701
 #define RPC_S_INVALID_BINDING                              1702