diff --git a/src/context/DisplayModeContext.ts b/src/context/DisplayModeContext.ts
index 6a59de7..a7f77dc 100644
--- a/src/context/DisplayModeContext.ts
+++ b/src/context/DisplayModeContext.ts
@@ -1,10 +1,15 @@
 import React from "react";
 import { ViewMode } from "../routes/ViewMode";
 
-export const DisplayModeContext = React.createContext<{
-  mode: ViewMode;
-  setMode: (mode: ViewMode) => void;
-}>({
+const defaultValue: DisplayModeContextType = {
   mode: "map",
   setMode: () => {},
-});
+};
+
+interface DisplayModeContextType {
+  mode: ViewMode;
+  setMode: (mode: ViewMode) => void;
+}
+
+export const DisplayModeContext =
+  React.createContext<DisplayModeContextType>(defaultValue);