diff --git a/packages/react-base16-styling/src/index.ts b/packages/react-base16-styling/src/index.ts
index ad2c3105..382fcec3 100644
--- a/packages/react-base16-styling/src/index.ts
+++ b/packages/react-base16-styling/src/index.ts
@@ -38,10 +38,10 @@ const merger = (styling: Styling) => {
   });
 };
 
-const mergeStyling = function mergeStyling(
+const mergeStyling = (
   customStyling: StylingValue,
   defaultStyling: StylingValue
-): StylingValue | undefined {
+): StylingValue | undefined => {
   if (customStyling === undefined) {
     return defaultStyling;
   }