diff --git a/src/custom-tab-bar/index.tsx b/src/custom-tab-bar/index.tsx
index c16baaf..7ed003d 100644
--- a/src/custom-tab-bar/index.tsx
+++ b/src/custom-tab-bar/index.tsx
@@ -30,7 +30,7 @@ function getSafeBottom(): number {
   try {
     const info = Taro.getSystemInfoSync()
     if (info.safeArea) {
-      return info.safeArea.bottom
+      return info.screenHeight - info.safeArea.bottom
     }
   } catch { /* ignore */ }
   return 0