diff --git a/examples/pltslamshow.py b/examples/pltslamshow.py
index 8763d7e..ae75e2c 100644
--- a/examples/pltslamshow.py
+++ b/examples/pltslamshow.py
@@ -86,9 +86,11 @@ class SlamShow(object):
 
         # Hence we must relabel the axis ticks to show millimeters
         ticks = np.arange(0,self.map_size_pixels+100,100)
-        labels = [str(map_scale_mm_per_pixel * tick) for tick in ticks]
+        labels = [str(self.map_scale_mm_per_pixel * tick) for tick in ticks]
         self.ax.xaxis.set_ticks(ticks)
         self.ax.set_xticklabels(labels)
+        self.ax.yaxis.set_ticks(ticks)
+        self.ax.set_yticklabels(labels)
 
         self.ax.set_xlabel('X (mm)')
         self.ax.set_ylabel('Y (mm)')