diff --git a/setvar.bat b/setvar.bat
index 1d57fa6..2ceea1f 100644
--- a/setvar.bat
+++ b/setvar.bat
@@ -1,2 +1,2 @@
-set CFLAGS=/MT /DNOMINMAX /Ox /DNDEBUG /W4 /Zi /EHsc /nologo -I./include -I../cybozulib_ext/include
+set CFLAGS=/MT /DNOMINMAX /Ox /DNDEBUG /openmp /W4 /Zi /EHsc /nologo -I./include -I../cybozulib_ext/include
 set LDFLAGS=/LIBPATH:..\cybozulib_ext\lib /LIBPATH:.\lib