diff --git a/man/sd_bus_set_server.xml b/man/sd_bus_set_server.xml
index 228dc806e4..6b93b92594 100644
--- a/man/sd_bus_set_server.xml
+++ b/man/sd_bus_set_server.xml
@@ -110,7 +110,8 @@
     a non-negative integer. On failure, they return a negative errno-style error code.</para>
 
     <para><function>sd_bus_is_server()</function> and <function>sd_bus_is_bus_client()</function>
-    return 1 when the server or client mode is enabled, respectively. Otherwise, they return 0.
+    return a positive integer when the server or client mode is enabled, respectively. Otherwise,
+    they return zero.
     </para>
 
     <refsect2>