--- a/bus/system.conf.in
+++ b/bus/system.conf.in
@@ -48,7 +48,7 @@
     <!-- Holes must be punched in service configuration files for
          name ownership and sending method calls -->
     <deny own="*"/>
-    <deny send_type="method_call"/>
+    <deny send_type="method_call" log="true"/>
 
     <!-- Signals and reply messages (method returns, errors) are allowed
          by default -->