diff --git a/Makefile b/Makefile

index 5791d8fa22..2f49bfee68 100644

--- a/Makefile

+++ b/Makefile

@@ -255,11 +255,11 @@ genman: man/containerd.8 man/ctr.8

 man/containerd.8: FORCE

 	@echo "$(WHALE) $@"

-	$(GO) run -mod=readonly ${GO_TAGS} cmd/gen-manpages/main.go $(@F) $(@D)

+	$(GO) run -mod=vendor ${GO_TAGS} cmd/gen-manpages/main.go $(@F) $(@D)

 man/ctr.8: FORCE

 	@echo "$(WHALE) $@"

-	$(GO) run -mod=readonly ${GO_TAGS} cmd/gen-manpages/main.go $(@F) $(@D)

+	$(GO) run -mod=vendor ${GO_TAGS} cmd/gen-manpages/main.go $(@F) $(@D)

 man/%: docs/man/%.md FORCE

 	@echo "$(WHALE) $@"