diff --git a/fatresize.c b/fatresize.c
index 414f9e7..09bdc74 100644
--- a/fatresize.c
+++ b/fatresize.c
@@ -208,7 +208,7 @@ static int get_device(char *dev) {
       return 0;
     }
   } else {
-    opts.pnum = get_partnum(devname);
+    opts.pnum = get_partnum(dev);
   }
   ped_device_destroy(peddev);
   opts.device = devname;