diff --git a/packages/tailwindcss/src/compat/plugin-api.ts b/packages/tailwindcss/src/compat/plugin-api.ts
index 5954040017d2..f20ba162da55 100644
--- a/packages/tailwindcss/src/compat/plugin-api.ts
+++ b/packages/tailwindcss/src/compat/plugin-api.ts
@@ -18,7 +18,7 @@ import { walk, WalkAction } from '../walk'
 import type { ResolvedConfig, UserConfig } from './config/types'
 import { createThemeFn } from './plugin-functions'
 
-export type Config = UserConfig
+export interface Config extends UserConfig {}
 export type PluginFn = (api: PluginAPI) => void
 export type PluginWithConfig = {
   handler: PluginFn
diff --git a/packages/tailwindcss/src/index.ts b/packages/tailwindcss/src/index.ts
index a511b08386f2..e8f238c7b95d 100644
--- a/packages/tailwindcss/src/index.ts
+++ b/packages/tailwindcss/src/index.ts
@@ -34,7 +34,7 @@ import { segment } from './utils/segment'
 import { topologicalSort } from './utils/topological-sort'
 import { compoundsForSelectors, IS_VALID_VARIANT_NAME, substituteAtVariant } from './variants'
 import { walk, WalkAction } from './walk'
-export type Config = UserConfig
+export interface Config extends UserConfig {}
 
 const IS_VALID_PREFIX = /^[a-z]+$/