diff --git a/src/playbin.vala b/src/playbin.vala
index 65dc7ed..121fa19 100644
--- a/src/playbin.vala
+++ b/src/playbin.vala
@@ -243,7 +243,7 @@ class Playbin : GLib.Object {
 
         this.current_song = song;
         this.position = 0;
-        this.duration = song.duration * 1000000000 - 1;
+        this.duration = song.duration * Gst.SECOND - 1;
         this.now_playing (false);
     }
 
diff --git a/src/ui/window.vala b/src/ui/window.vala
index 7f141ce..862670a 100644
--- a/src/ui/window.vala
+++ b/src/ui/window.vala
@@ -134,8 +134,7 @@ class Ui.Window : Adw.ApplicationWindow {
             // treat 1 nanosecond as a sentinel value
             return "-";
         }
-        int64 ms = ns / 1000000;
-        int s = (int) (ms / 1000);
+        int s = (int) (ns / Gst.SECOND);
         return "%02d:%02d".printf (s/60, s%60);
     }
     
@@ -203,14 +202,14 @@ class Ui.Window : Adw.ApplicationWindow {
 
     [GtkCallback] private void seek_backward () {
         // 10 seconds
-        int64 new_position = position - (int64)10 * 1000 * 1000000;
+        int64 new_position = position - 10 * Gst.SECOND;
         if (new_position < 0) new_position = 0;
         this.seek_impl (new_position);
     }
 
     [GtkCallback] private void seek_forward () {
         // 10 seconds
-        int64 new_position = position + (int64)10 * 1000 * 1000000;
+        int64 new_position = position + 10 * Gst.SECOND;
         if (new_position > this.playbin.duration) new_position = this.playbin.duration;
         this.seek_impl (new_position);
     }