diff --git a/test/function_n_test.cpp b/test/function_n_test.cpp
index 19942f0..a773bfc 100644
--- a/test/function_n_test.cpp
+++ b/test/function_n_test.cpp
@@ -105,7 +105,7 @@ test_zero_args()
   BOOST_TEST(v1.empty());
 
   // Assignment to an empty function from a free function
-  v1 = write_five;
+  v1 = &write_five;
   BOOST_TEST(!v1.empty());
 
   // Invocation