--- a/cli-runopts.c
+++ b/cli-runopts.c
@@ -296,6 +296,8 @@ void cli_getopts(int argc, char ** argv)
 					debug_trace = 1;
 					break;
 #endif
+				case 'x':
+					break;
 				case 'F':
 				case 'e':
 #ifndef ENABLE_USER_ALGO_LIST
