diff --git a/mk/versions.mk b/mk/versions.mk
index 6e20be06b9f9..f83f81c557c9 100644
--- a/mk/versions.mk
+++ b/mk/versions.mk
@@ -59,6 +59,7 @@ endef
 $(shell rm -f .check-versions-failure)
 $(eval $(call CheckSubmoduleTemplate,llvm,LLVM))
 $(eval $(call CheckSubmoduleTemplate,mono,MONO))
+$(eval $(call CheckSubmoduleTemplate,watch-mono,WATCH_MONO))
 $(eval $(call CheckSubmoduleTemplate,fsharp,FSHARP))
 $(eval $(call CheckSubmoduleTemplate,cecil,CECIL))
 $(eval $(call CheckSubmoduleTemplate,MonoTouch.Dialog,MONOTOUCH_DIALOG))