diff --git a/tests/opendev/build.bat b/tests/opendev/build.bat
index 0383540..bd86e92 100644
--- a/tests/opendev/build.bat
+++ b/tests/opendev/build.bat
@@ -1,2 +1,3 @@
 @ECHO OFF
-wcl -e3-we-wx-zq-os-s-zp1-mt-bt=DOS opendev.c
+:: use -ms for exe, -mt for com
+wcl -e3-we-wx-zq-os-s-zp1-ms-bt=DOS opendev.c