diff --git a/cpp/libs/libs.cmake b/cpp/libs/libs.cmake
index c652face..396c0c24 100644
--- a/cpp/libs/libs.cmake
+++ b/cpp/libs/libs.cmake
@@ -25,6 +25,9 @@ if(USE_VCLTL)
 if(${CMAKE_SIZEOF_VOID_P} EQUAL 4)
     set(LTLPlatform "Win32")
 endif()
+if(WINXP)
+set(WindowsTargetPlatformMinVersion "5.1.2600.0")
+endif()
 include("${CMAKE_CURRENT_LIST_DIR}/VC-LTL helper for cmake.cmake")
 endif()