diff --git a/cli/schemas/config-file.v1.json b/cli/schemas/config-file.v1.json
index c10ca80a13..8f9866f174 100644
--- a/cli/schemas/config-file.v1.json
+++ b/cli/schemas/config-file.v1.json
@@ -73,7 +73,7 @@
           "description": "Specify a set of bundled library declaration files that describe the target runtime environment.",
           "type": "array",
           "uniqueItems": true,
-          "default": "deno.window",
+          "default": ["deno.window"],
           "items": {
             "type": "string"
           },