diff --git a/gendeps.go b/gendeps.go
index b4f1deb53..be9bf9e29 100644
--- a/gendeps.go
+++ b/gendeps.go
@@ -36,6 +36,9 @@ import (
 func GenDepMods(mod *gopmod.Module, dir string, recursively bool) (ret map[string]struct{}, err error) {
 	modBase := mod.Path()
 	ret = make(map[string]struct{})
+	for _, r := range mod.Register {
+		ret[r.ClassfileMod] = struct{}{}
+	}
 	err = HandleDeps(mod, dir, recursively, func(pkgPath string) {
 		modPath, _ := modfetch.Split(pkgPath, modBase)
 		if modPath != "" && modPath != modBase {