diff --git a/test/compile_fail/attr_functor_void_return.cpp b/test/compile_fail/attr_functor_void_return.cpp
index c9701e0..5ad7a59 100644
--- a/test/compile_fail/attr_functor_void_return.cpp
+++ b/test/compile_fail/attr_functor_void_return.cpp
@@ -25,7 +25,7 @@ namespace attrs = logging::attributes;
 namespace {
 
     // A test function that returns an attribute value
-    void get_attr_value();
+    void get_attr_value() {}
 
 } // namespace