diff --git a/lib/context.js b/lib/context.js
index 410996b..5d547af 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -279,7 +279,12 @@ class ContextSession {
     const externalKey = this.externalKey;
 
     if (externalKey) await this.store.destroy(externalKey);
-    ctx.cookies.set(key, '', opts);
+
+    if (opts.externalKey) {
+      opts.externalKey.set(ctx, '');
+    } else {
+      ctx.cookies.set(key, '', opts);
+    }
   }
 
   /**