diff --git a/examples/reference-wrappers/src/input.h b/examples/reference-wrappers/src/input.h
index 5e3c6e9..dd37dfa 100644
--- a/examples/reference-wrappers/src/input.h
+++ b/examples/reference-wrappers/src/input.h
@@ -18,6 +18,7 @@
     Goat() : horns(0) {}
     void add_a_horn();
     std::string describe() const;
+    uint32_t& get_horns() { return horns; }
 private:
     uint32_t horns;
 };