diff --git a/modules/09_cpp11/src/move_semantics.cpp b/modules/09_cpp11/src/move_semantics.cpp
index 1ab142f..2a3f1cf 100644
--- a/modules/09_cpp11/src/move_semantics.cpp
+++ b/modules/09_cpp11/src/move_semantics.cpp
@@ -17,8 +17,7 @@ auto MovableBuffer::size() const -> std::size_t { return data_.size(); }
 auto MovableBuffer::data() const -> const std::vector<int>& { return data_; }
 
 auto consume(MovableBuffer buffer) -> std::size_t {
-    (void)buffer;
-    return 0;
+    return buffer.size();
 }
 
 }  // namespace cpp11