diff --git a/packages/material-ui/src/styles/createSpacing.d.ts b/packages/material-ui/src/styles/createSpacing.d.ts
index 5d1db8658aad23..ab73efaa7013d0 100644
--- a/packages/material-ui/src/styles/createSpacing.d.ts
+++ b/packages/material-ui/src/styles/createSpacing.d.ts
@@ -15,6 +15,6 @@ export interface Spacing {
   ): string;
 }
 
-export type SpacingOptions = number | ((factor: number) => string | number);
+export type SpacingOptions = number | ((factor: number) => string | number) | number[];
 
 export default function createSpacing(spacing: SpacingOptions): Spacing;