diff --git a/gtk2_ardour/audio_clock.cc b/gtk2_ardour/audio_clock.cc
index 6d029f1be5..8edb5d7ef2 100644
--- a/gtk2_ardour/audio_clock.cc
+++ b/gtk2_ardour/audio_clock.cc
@@ -1310,7 +1310,7 @@ AudioClock::set_bbt (timepos_t const & w, timecnt_t const & o, bool /*force*/)
 		} else
 #endif
 		{
-			snprintf (buf, sizeof(buf), "1/%.0f = %.3f", m.tempo().note_type(), m.tempo().note_types_per_minute());
+			snprintf (buf, sizeof(buf), "1/%d = %.3f",m.tempo().note_type(), m.tempo().note_types_per_minute());
 			_left_btn.set_text (buf, false);
 		}