diff --git a/Tests/xmake.lua b/Tests/xmake.lua
index 8b90ad0..6b10fa7 100644
--- a/Tests/xmake.lua
+++ b/Tests/xmake.lua
@@ -206,8 +206,8 @@ for name, module in pairs(tests) do
 				add_defines("BACKTRACE")
 			elseif is_plat("windows") then
 				add_defines("WINTRACE")
-				add_cflags("/Zi")
-				add_ldflags("/DEBUG")
+				add_cxflags("/Zi", "/FS", {force = true}) -- safe parallel build
+				add_ldflags("/DEBUG", {force = true})
 				add_links("dbghelp")
 			end
 		target_end()