diff --git a/src/composables/useTheme.ts b/src/composables/useTheme.ts
index 87fc2a1..828dad3 100644
--- a/src/composables/useTheme.ts
+++ b/src/composables/useTheme.ts
@@ -1,4 +1,4 @@
-import { ref } from 'vue'
+import { ref, reactive } from 'vue'
 
 const STORAGE_KEY = 'mach-theme'
 const isDark = ref(false)
@@ -29,8 +29,8 @@ export function initTheme(): void {
 
 export function useTheme() {
   initTheme()
-  return {
+  return reactive({
     isDark,
     toggle: () => applyTheme(!isDark.value)
-  }
+  })
 }
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