diff --git a/types/styled-system/index.d.ts b/types/styled-system/index.d.ts
index 3659bd1fb2..cd99b16a63 100644
--- a/types/styled-system/index.d.ts
+++ b/types/styled-system/index.d.ts
@@ -586,6 +586,7 @@ declare module "styled-system" {
         cssProperty?: string;
         key?: string;
         numberToPx?: boolean;
+        alias?: string;
     }
 
     export function style(args: LowLevelStyleFunctionArguments): any;