diff --git a/lib/global.js b/lib/global.js
index 95c9614a..a080f270 100644
--- a/lib/global.js
+++ b/lib/global.js
@@ -72,7 +72,8 @@ export function GlobalContextProvider({ children }) {
     const currentIndex = THEMES.indexOf(theme)
     const newIndex = currentIndex < THEMES.length - 1 ? currentIndex + 1 : 0
     const newTheme = THEMES[newIndex]
-    const query = { ...router.query, theme: newTheme }
+    const query = router.query
+    query.theme = newTheme
     router.push({ pathname: router.pathname, query })
     return newTheme
   }