diff --git a/src/silx/gui/plot/actions/control.py b/src/silx/gui/plot/actions/control.py
index 4ff7c91248..897c3d1412 100755
--- a/src/silx/gui/plot/actions/control.py
+++ b/src/silx/gui/plot/actions/control.py
@@ -331,7 +331,7 @@ def __init__(self, plot, parent=None):
         self.plot.sigActiveImageChanged.connect(self._updateColormap)
         self.plot.sigActiveScatterChanged.connect(self._updateColormap)
 
-    def setColormapDialog(self, colormapDialog):
+    def setColormapDialog(self, dialog):
         """Set a specific color dialog instead of using the default dialog."""
         assert(colormapDialog is not None)
         if self._dialog is not None: