diff --git a/src/rime/schema.cc b/src/rime/schema.cc
index 559cb7a8a..3026dda95 100644
--- a/src/rime/schema.cc
+++ b/src/rime/schema.cc
@@ -30,6 +30,9 @@ void Schema::FetchUsefulConfigItems() {
     schema_name_ = schema_id_;
   }
   config_->GetInt("menu/page_size", &page_size_);
+  if (page_size_ < 1) {
+    page_size_ = 5;
+  }
   config_->GetString("menu/alternative_select_keys", &select_keys_);
   config_->GetBool("menu/page_down_cycle", &page_down_cycle_);
 }