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diff --git a/src/sage/plot/contour_plot.py b/src/sage/plot/contour_plot.py
index a7533fa3d9..12a2b1f670 100644
--- a/src/sage/plot/contour_plot.py
+++ b/src/sage/plot/contour_plot.py
@@ -223,7 +223,7 @@ class ContourPlot(GraphicPrimitive):
cb.add_lines(CS)
-@suboptions('colorbar', orientation='vertical', format=None, spacing=None)
+@suboptions('colorbar', orientation='vertical', format=None, spacing='uniform')
@suboptions('label', fontsize=9, colors='blue', inline=None, inline_spacing=3,
fmt="%1.2f")
@options(plot_points=100, fill=True, contours=None, linewidths=None,
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