diff --git a/ulib/args/args.c b/ulib/args/args.c
index 89c4da9..20c658d 100644
--- a/ulib/args/args.c
+++ b/ulib/args/args.c
@@ -19,6 +19,9 @@ int32_t parse_args(char **argv, size_t argc, Arg *defs) {
               case ARG_STRING:
                 *((char **)def->ptr) = argv[i+1];
                 break;
+              case ARG_BOOL:
+                *((bool *)def->ptr) = string_strcmp(argv[i+1], "yes") == 0;
+                break;
             }
             i++;
           }
diff --git a/ulib/args/args.h b/ulib/args/args.h
index 38db4f9..4d19828 100644
--- a/ulib/args/args.h
+++ b/ulib/args/args.h
@@ -10,7 +10,7 @@ size_t argslen(void);
 
 typedef struct {
   char *shortname;
-  enum { ARG_STRING } expected_value;
+  enum { ARG_STRING, ARG_BOOL } expected_value;
   void *ptr;
   bool end;
 } Arg;