diff --git a/packages/mui-system/src/index.d.ts b/packages/mui-system/src/index.d.ts
index a9f5521a773092..66f2a1ae612d31 100644
--- a/packages/mui-system/src/index.d.ts
+++ b/packages/mui-system/src/index.d.ts
@@ -1,4 +1,3 @@
-import { CSSObject } from '@emotion/react';
 import {
   ComposedStyleFunction,
   StyleFunction,
@@ -14,7 +13,6 @@ import {
   sizing,
   typography,
 } from './Box';
-import { Breakpoints } from './createTheme/createBreakpoints';
 // disable automatic export
 export {};
 
@@ -34,7 +32,7 @@ export type BordersProps = PropsFor<typeof borders>;
 
 // breakpoints.js
 type DefaultBreakPoints = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
-export { handleBreakpoints } from './breakpoints';
+export { handleBreakpoints, mergeBreakpointsInOrder } from './breakpoints';
 
 /**
  * @returns An enhanced stylefunction that considers breakpoints
@@ -43,11 +41,6 @@ export function breakpoints<Props, Breakpoints extends string = DefaultBreakPoin
   styleFunction: StyleFunction<Props>,
 ): StyleFunction<Partial<Record<Breakpoints, Props>> & Props>;
 
-// restructures the breakpoints in the correct order and merges all styles args
-export function mergeBreakpointsInOrder(
-  breakpointsInputs: Breakpoints,
-  styles: CSSObject[],
-): CSSObject;
 
 export function compose<T extends Array<StyleFunction<any>>>(...args: T): ComposedStyleFunction<T>;