diff --git a/group.go b/group.go
index 2f82d00..5cd1ce5 100644
--- a/group.go
+++ b/group.go
@@ -14,9 +14,14 @@ type Group struct {
 
 // NewGroup adds a sub-group to this group.
 func (g *Group) NewGroup(path string, opts ...GroupOption) *Group {
+	path = joinPath(g.path, path)
+	if path == "/" {
+		path = ""
+	}
+
 	group := &Group{
 		router: g.router,
-		path:   joinPath(g.path, path),
+		path:   path,
 		stack:  g.cloneStack(),
 	}