diff --git a/src/mergerfs.cpp b/src/mergerfs.cpp
index dd1d5088..2c7cf24f 100644
--- a/src/mergerfs.cpp
+++ b/src/mergerfs.cpp
@@ -409,6 +409,7 @@ main(int    argc_,
     ;
 
   app.add_option("mountpoint",mountpoint)
+    ->expected(1)
     ->required()
     ->take_last()
     ;