diff --git a/include/connection.h b/include/connection.h
index abe19e2..18215f4 100644
--- a/include/connection.h
+++ b/include/connection.h
@@ -190,7 +190,7 @@ public:
      *  meantime you can already send more instructions over it)
      *  @return bool
      */
-    std::size_t waiting() const
+    bool waiting() const
     {
         return _implementation.waiting();
     }