diff --git a/spa/include/spa/utils/json.h b/spa/include/spa/utils/json.h
index 6fa8c7806..40d2f6aba 100644
--- a/spa/include/spa/utils/json.h
+++ b/spa/include/spa/utils/json.h
@@ -176,7 +176,7 @@ static inline int spa_json_next(struct spa_json * iter, const char **value)
 				iter->state = __UTF8 | flag;
 				continue;
 			default:
-				if (cur >= 32 && cur <= 126)
+				if (cur >= 32 && cur <= 127)
 					continue;
 			}
 			goto error;