diff --git a/src/bs11_config.c b/src/bs11_config.c
index 57ed902..ceb23a8 100644
--- a/src/bs11_config.c
+++ b/src/bs11_config.c
@@ -701,6 +701,7 @@
 			{ "win-size", 1, 0, 'w' },
 			{ "forced", 0, 0, 'f' },
 			{ "restart", 0, 0, 'r' },
+			{ "debug", 1, 0, 'b'},
 		};
 
 		c = getopt_long(argc, argv, "hp:s:S:td:Dw:fra:",
@@ -716,6 +717,9 @@
 		case 'p':
 			serial_port = optarg;
 			break;
+		case 'b':
+			debug_parse_category_mask(optarg);
+			break;
 		case 's':
 			fname_software = optarg;
 			break;