diff --git a/Makefile b/Makefile
index 36fc9fa2768f2089f50517b86b55fa578e9baddb..9ab0ba95fa2a1d676bc987b47eed16c45d1f8b23 100644
--- a/Makefile
+++ b/Makefile
@@ -74,8 +74,8 @@ html gallinahtml: $(COQ_MAKEFILE)
 	$(MAKE) -f $(COQ_MAKEFILE) $@
 
 vacuum: allCoqProject cleanall
-	@echo 'VACUUMING *.vo *.glob .*.aux <empty directories>'
-	@find . -depth \( -iname '*.vo' -or  -iname '*.glob' -or -iname '.*.aux' \)  ! -path './.git/*' -delete
+	@echo 'VACUUMING *.vo *.vok *.vos *.glob .*.aux <empty directories>'
+	@find . -depth \( -iname '*.vo' -or -iname "*.vok" -or -iname "*.vok" -or  -iname '*.glob' -or -iname '.*.aux' \)  ! -path './.git/*' -delete
 	@find . -depth -type d -empty ! -path './.git/*' -delete
 
 macos-clean: