diff --git a/repos/os/include/timer_session/connection.h b/repos/os/include/timer_session/connection.h
index 7a6535029e..a0a6fb1f3b 100644
--- a/repos/os/include/timer_session/connection.h
+++ b/repos/os/include/timer_session/connection.h
@@ -192,6 +192,7 @@ class Timer::Connection : public  Genode::Connection<Session>,
 		enum { MAX_INTERPOLATION_QUALITY  = 3 };
 		enum { MAX_REMOTE_TIME_LATENCY_US = 500 };
 		enum { MAX_REMOTE_TIME_TRIALS     = 5 };
+		enum { NR_OF_INITIAL_CALIBRATIONS = 3 * MAX_INTERPOLATION_QUALITY };
 		enum { MIN_FACTOR_LOG2            = 8 };
 
 		Genode::Io_signal_handler<Connection> _signal_handler;
diff --git a/repos/os/src/lib/timeout/timer_connection.cc b/repos/os/src/lib/timeout/timer_connection.cc
index 6cdb03b014..3d2395fddb 100644
--- a/repos/os/src/lib/timeout/timer_connection.cc
+++ b/repos/os/src/lib/timeout/timer_connection.cc
@@ -119,6 +119,11 @@ void Timer::Connection::_enable_modern_mode()
 	_mode = MODERN;
 	_sigh(_signal_handler);
 	_scheduler._enable();
+
+	/* do initial calibration burst to make interpolation available earlier */
+	for (unsigned i = 0; i < NR_OF_INITIAL_CALIBRATIONS; i++) {
+		_update_real_time();
+	}
 }