diff --git a/lib/utils/style-variables/index.js b/lib/utils/style-variables/index.js
index 3127166a4..eca2f39d1 100644
--- a/lib/utils/style-variables/index.js
+++ b/lib/utils/style-variables/index.js
@@ -32,8 +32,8 @@ module.exports = {
   StyleVariablesContext
 }
 
-/** @type {Map<VElement, StyleVariablesContext>} */
-const cache = new Map()
+/** @type {WeakMap<VElement, StyleVariablesContext>} */
+const cache = new WeakMap()
 /**
  * Get the style vars context
  * @param {RuleContext} context