diff --git a/lex/cli/build.ts b/lex/cli/build.ts
index 6cc3cfe..e7bfe9d 100644
--- a/lex/cli/build.ts
+++ b/lex/cli/build.ts
@@ -19,9 +19,9 @@ const command = new Command()
     default: false,
   })
   .option(
-    "--override",
+    "--override [override:boolean]",
     "override existing files (no effect when --clear is set)",
-    { default: false },
+    { default: true },
   )
   .option("--js", "use .js extension for imports and generated files", {
     default: false,
diff --git a/lex/deno.json b/lex/deno.json
index c96c2bc..9dc400b 100644
--- a/lex/deno.json
+++ b/lex/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@atp/lex",
-  "version": "0.1.0-alpha.2",
+  "version": "0.1.0-alpha.3",
   "exports": {
     ".": "./mod.ts",
     "./cbor": "./cbor/mod.ts",