diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index 712fa654632..ed428c6a0b0 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -1087,11 +1087,10 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
                 }
                 case ARG_NO_NEW_PRIVILEGES:
-                        r = parse_boolean(optarg);
+                        r = parse_boolean_argument("--no-new-privileges=", optarg, &arg_no_new_privileges);
                         if (r < 0)
-                                return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg);
+                                return r;
 
-                        arg_no_new_privileges = r;
                         arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES;
                         break;
 
@@ -1165,13 +1164,10 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
 
                 case ARG_REGISTER:
-                        r = parse_boolean(optarg);
-                        if (r < 0) {
-                                log_error("Failed to parse --register= argument: %s", optarg);
+                        r = parse_boolean_argument("--register=", optarg, &arg_register);
+                        if (r < 0)
                                 return r;
-                        }
 
-                        arg_register = r;
                         break;
 
                 case ARG_KEEP_UNIT: