diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 79bda1bcc5..a63e310b3f 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -48,6 +48,7 @@
 #include "ardour_ui.h"
 #include "engine_dialog.h"
 #include "gui_thread.h"
+#include "utils.h"
 #include "i18n.h"
 
 using namespace std;
@@ -800,18 +801,6 @@ EngineControl::device_changed ()
 	push_state_to_backend (false);
 }	
 
-string
-EngineControl::rate_as_string (float r)
-{
-	char buf[32];
-	if (fmod (r, 1000.0f)) {
-		snprintf (buf, sizeof (buf), "%.1f kHz", r/1000.0);
-	} else {
-		snprintf (buf, sizeof (buf), "%.0f kHz", r/1000.0);
-	}
-	return buf;
-}
-
 string
 EngineControl::bufsize_as_string (uint32_t sz)
 {
diff --git a/gtk2_ardour/engine_dialog.h b/gtk2_ardour/engine_dialog.h
index 59924e0f0a..ac17814a5f 100644
--- a/gtk2_ardour/engine_dialog.h
+++ b/gtk2_ardour/engine_dialog.h
@@ -122,7 +122,6 @@ class EngineControl : public ArdourDialog, public PBD::ScopedConnectionList {
     void setup_midi_tab_for_jack ();
     void refresh_midi_display ();
     
-    std::string rate_as_string (float);
     std::string bufsize_as_string (uint32_t);
 
     float get_rate() const;
diff --git a/gtk2_ardour/utils.cc b/gtk2_ardour/utils.cc
index c81aff85ab..a0fd7016b5 100644
--- a/gtk2_ardour/utils.cc
+++ b/gtk2_ardour/utils.cc
@@ -28,6 +28,7 @@
 #include <clocale>
 #include <cstring>
 #include <cctype>
+#include <cmath>
 #include <fstream>
 #include <list>
 #include <sys/stat.h>
@@ -860,3 +861,15 @@ unique_random_color (list<Gdk::Color>& used_colors)
 		/* XXX need throttle here to make sure we don't spin for ever */
 	}
 }
+
+string 
+rate_as_string (float r)
+{
+	char buf[32];
+	if (fmod (r, 1000.0f)) {
+		snprintf (buf, sizeof (buf), "%.1f kHz", r/1000.0);
+	} else {
+		snprintf (buf, sizeof (buf), "%.0f kHz", r/1000.0);
+	}
+	return buf;
+}
diff --git a/gtk2_ardour/utils.h b/gtk2_ardour/utils.h
index 5d7bf000ea..a1a54898b5 100644
--- a/gtk2_ardour/utils.h
+++ b/gtk2_ardour/utils.h
@@ -86,4 +86,6 @@ std::string escape_angled_brackets (std::string const &);
 
 Gdk::Color unique_random_color (std::list<Gdk::Color> &);
 
+std::string rate_as_string (float r);
+
 #endif /* __ardour_gtk_utils_h__ */