diff --git a/AK/StackInfo.h b/AK/StackInfo.h
index 668bbd802f2..f741cd54561 100644
--- a/AK/StackInfo.h
+++ b/AK/StackInfo.h
@@ -19,8 +19,8 @@ public:
     size_t size() const { return m_size; }
     size_t size_free() const
     {
-        FlatPtr dummy;
-        return reinterpret_cast<FlatPtr>(&dummy) - m_base;
+        auto p = reinterpret_cast<FlatPtr>(__builtin_frame_address(0));
+        return p - m_base;
     }
 
 private: