diff --git a/src/mergerfs.cpp b/src/mergerfs.cpp
index b5650860..dcfaac75 100644
--- a/src/mergerfs.cpp
+++ b/src/mergerfs.cpp
@@ -409,6 +409,10 @@ main(int    argc_,
     ->required()
     ;
 
+  app.add_option("mountpoint")
+    ->required()
+    ;
+
   try
     {
       app.parse(argc_,argv_);