diff -r 067ea2315a8a -r 5da2cf15eb44 dav/optparser.c
--- a/dav/optparser.c	Mon Dec 18 11:56:11 2017 +0100
+++ b/dav/optparser.c	Mon Dec 18 16:24:32 2017 +0100
@@ -210,6 +210,20 @@
                         }
                         break;
                     }
+                    case 'F': {
+                        if(!option) {
+                            option = "progressfile";
+                            optchar = 'F';
+                        } else {
+                            fprintf(
+                                    stderr,
+                                    "Missing argument for option -%c\n",
+                                    optchar);
+                            cmd_args_free(a);
+                            return NULL;
+                        }
+                        break;
+                    }
                 }
             }
         } else if(option) {