diff --git a/man/sd_bus_slot_set_destroy_callback.xml b/man/sd_bus_slot_set_destroy_callback.xml
index d868c6f308..85e5d0c7c5 100644
--- a/man/sd_bus_slot_set_destroy_callback.xml
+++ b/man/sd_bus_slot_set_destroy_callback.xml
@@ -31,7 +31,7 @@
       <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
 
       <funcprototype>
-        <funcdef>typedef int (*<function>sd_bus_destroy_t</function>)</funcdef>
+        <funcdef>typedef void (*<function>sd_bus_destroy_t</function>)</funcdef>
         <paramdef>void *<parameter>userdata</parameter></paramdef>
       </funcprototype>