diff --git a/Scheduler/ClockService.cc b/Scheduler/ClockService.cc
index 7bba90ddcbdd0b471c32fa7b092c37771ab10860..7754f4c2380efe67f3b4532bc2720025e23b9162 100644
--- a/Scheduler/ClockService.cc
+++ b/Scheduler/ClockService.cc
@@ -79,6 +79,12 @@ senf::parseClockServiceInterval(console::ParseCommandInfo::TokensRange const & t
         throw senf::console::SyntaxErrorException();
 }
 
+prefix_ void senf::formatClockServiceInterval(ClockService::clock_type interval,
+                                              std::ostream & os)
+{
+    os << interval << "ns";
+}
+
 ///////////////////////////////cc.e////////////////////////////////////////
 #undef prefix_
 //#include "ClockService.mpp"
diff --git a/Scheduler/ClockService.hh b/Scheduler/ClockService.hh
index 68b4a44fdcd41b28c483f24f7163fc21d80118ca..8fb1341a12d8d56bd24d20c7a205135b782dcbc8 100644
--- a/Scheduler/ClockService.hh
+++ b/Scheduler/ClockService.hh
@@ -199,6 +199,8 @@ namespace senf {
      */
     void parseClockServiceInterval(console::ParseCommandInfo::TokensRange const & tokens, 
                                    ClockService::clock_type & out);
+
+    void formatClockServiceInterval(ClockService::clock_type interval, std::ostream & os);
 }
 
 ///////////////////////////////hh.e////////////////////////////////////////