diff --git a/build_msvc.bat b/build_msvc.bat
index 74d5803..f3b2c98 100644
--- a/build_msvc.bat
+++ b/build_msvc.bat
@@ -1 +1 @@
-cl.exe /Ox /openmp /I. run.c win.c
+cl.exe /fp:fast /Ox /openmp /I. run.c win.c