diff --git a/kwant/plotter.py b/kwant/plotter.py
index b591d585e1f815cf881b09eae4ea7f33a460a1d1..2f38fa9ce7c3602ff7a41ccaa8677235b6888c8f 100644
--- a/kwant/plotter.py
+++ b/kwant/plotter.py
@@ -2115,7 +2115,8 @@ def streamplot(field, box, cmap=None, bgcolor=None, linecolor='k',
 
     ax.streamplot(X, Y, field[:,:,0], field[:,:,1],
                   density=density, linewidth=linewidth,
-                  color=color, cmap=line_cmap, arrowstyle='->')
+                  color=color, cmap=line_cmap, arrowstyle='->',
+                  norm=matplotlib.colors.Normalize(0, 1))
 
     ax.set_xlim(*box[0])
     ax.set_ylim(*box[1])