diff --git a/lib/matplotlib/contour.py b/lib/matplotlib/contour.py
index f148d35618dd..efea024dc102 100644
--- a/lib/matplotlib/contour.py
+++ b/lib/matplotlib/contour.py
@@ -887,10 +887,12 @@ def __init__(self, ax, *args,
self.set_cmap(cmap)
if norm is not None:
self.set_norm(norm)
- if vmin is not None:
- self.norm.vmin = vmin
- if vmax is not None:
- self.norm.vmax = vmax
+ with self.norm.callbacks.blocked(signal="changed"):
+ if vmin is not None:
+ self.norm.vmin = vmin
+ if vmax is not None:
+ self.norm.vmax = vmax
+ self.norm._changed()
self._process_colors()
if self._paths is None:
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