diff --git a/examples/cluster.c b/examples/cluster.c
index 04e71d0..2fa7319 100644
--- a/examples/cluster.c
+++ b/examples/cluster.c
@@ -91,8 +91,11 @@ static void draw_speedometer(cairo_t *cr,
     cairo_stroke(cr);
 }
 
-static void draw_thermometer(cairo_t *cr) {
-    cairo_arc(cr, 442, 368, 64, 0, 360 * (M_PI/180));
+static void draw_thermometer(cairo_t *cr,
+                             double x,
+                             double y,
+                             double r) {
+    cairo_arc(cr, x, y, r, 0, 360 * (M_PI/180));
     cairo_stroke(cr);
 }
 
@@ -141,7 +144,7 @@ static void redraw(cairo_t *cr) {
 
     draw_tachometer(cr, 208, 240, 192);
     draw_speedometer(cr, 816, 240, 192);
-    draw_thermometer(cr);
+    draw_thermometer(cr, 442, 368, 64);
     draw_fuel_gauge(cr);
     draw_mfd(cr, 432, 48, 160, 240);
 }