diff --git a/api/ReadableStream.json b/api/ReadableStream.json
index d8d1563cca7afc..44295a5c7154cc 100644
--- a/api/ReadableStream.json
+++ b/api/ReadableStream.json
@@ -526,7 +526,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": "26.4"
+              "version_added": "preview"
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",