diff --git a/dts.snapshot.json b/dts.snapshot.json
index dd16b03..aee8e3c 100644
--- a/dts.snapshot.json
+++ b/dts.snapshot.json
@@ -6,8 +6,8 @@
     ]
   },
   "index.d.mts": {
-    "Options": "interface Options {\n include?: FilterPattern\n exclude?: FilterPattern\n includeNonExport?: boolean\n saveTo?: string\n}",
     "DtsSnapshot": "declare function DtsSnapshot(_: Options): Plugin",
+    "Options": "interface Options {\n include?: FilterPattern\n exclude?: FilterPattern\n includeNonExport?: boolean\n saveTo?: string\n}",
     "#exports": [
       "DtsSnapshot",
       "Options"
diff --git a/src/api.ts b/src/api.ts
index 631e8ec..e8cc79f 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -4,6 +4,7 @@ import { getPath } from '@dprint/typescript'
 import { walk } from 'estree-walker'
 import MagicString from 'magic-string'
 import { parseSync } from 'rolldown/experimental'
+import { sortObjectKeys } from './utils.ts'
 import type { Node, Span, TSTypeAnnotation } from '@oxc-project/types'
 
 const multilineCommentsRE = /\/\*.*?\*\//gs
@@ -101,7 +102,7 @@ export function snapshot(
       }
     }
 
-  return result
+  return sortObjectKeys(result)
 
   function nodeToString(node: Node) {
     return node.type === 'Identifier'
diff --git a/src/index.ts b/src/index.ts
index d9ef311..0d6eff2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,7 @@
 import { writeFile } from 'node:fs/promises'
 import { createFilter, type FilterPattern } from 'unplugin-utils'
 import { snapshot } from './api.ts'
+import { sortObjectKeys } from './utils.ts'
 import type { Plugin } from 'rolldown'
 
 const RE_DTS = /\.d\.[cm]?ts$/
@@ -61,7 +62,7 @@ export function DtsSnapshot({
           }
         }
 
-        const code = `${JSON.stringify(result, null, 2)}\n`
+        const code = `${JSON.stringify(sortObjectKeys(result), null, 2)}\n`
         await writeFile(saveTo, code)
       },
     },
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 0000000..473a11c
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,5 @@
+export function sortObjectKeys<T extends Record<string, any>>(obj: T): T {
+  return Object.fromEntries(
+    Object.entries(obj).toSorted(([a], [b]) => a.localeCompare(b)),
+  ) as T
+}
diff --git a/tsdown.config.ts b/tsdown.config.ts
index b19f688..6c6a976 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -2,7 +2,7 @@ import { defineConfig } from 'tsdown'
 import { DtsSnapshot } from './src/index.ts'
 
 export default defineConfig({
-  entry: ['src/*.ts'],
+  entry: ['src/index.ts', 'src/api.ts'],
   platform: 'node',
   exports: true,
   inlineOnly: ['estree-walker'],