diff --git a/mozilla/tools/tinderbox-configs/sunbird/win32/mozconfig b/mozilla/tools/tinderbox-configs/sunbird/win32/mozconfig
index 9ec9ce1b810..af32232f78d 100644
--- a/mozilla/tools/tinderbox-configs/sunbird/win32/mozconfig
+++ b/mozilla/tools/tinderbox-configs/sunbird/win32/mozconfig
@@ -4,8 +4,7 @@
 #
 
 mk_add_options MOZ_CO_PROJECT=calendar
-mk_add_options MOZ_CO_MODULE="mozilla/tools/codesighs"
-mk_add_options MOZ_CO_MODULE="mozilla/tools/trace-malloc"
+mk_add_options MOZ_CO_MODULE=mozilla/tools/codesighs,mozilla/tools/trace-malloc
 mk_add_options MOZ_MAKE_FLAGS="-j6"
 mk_add_options JS_READLINE=1
 # mk_add_options MOZ_INSTALLER_USE_7ZIP=1