diff --git a/python/plugins/processing/gui/NumberInputPanel.py b/python/plugins/processing/gui/NumberInputPanel.py
index f2e69570073..10b29cb1b1a 100644
--- a/python/plugins/processing/gui/NumberInputPanel.py
+++ b/python/plugins/processing/gui/NumberInputPanel.py
@@ -198,6 +198,7 @@ class NumberInputPanel(NUMBER_BASE, NUMBER_WIDGET):
             self.btnDataDefined = None
         else:
             self.btnDataDefined.init(0, QgsProperty(), self.param.dynamicPropertyDefinition())
+            self.btnDataDefined.registerEnabledWidget(self.spnValue, False)
 
         self.spnValue.valueChanged.connect(lambda: self.hasChanged.emit())