diff --git a/plugins/ImageReader/ImageReaderUI.py b/plugins/ImageReader/ImageReaderUI.py
index f4732c2843..103cd6f7e8 100644
--- a/plugins/ImageReader/ImageReaderUI.py
+++ b/plugins/ImageReader/ImageReaderUI.py
@@ -172,7 +172,7 @@ class ImageReaderUI(QObject):
 
     @pyqtSlot(int)
     def onColorModelChanged(self, value):
-        self.use_transparency_model = (value == 0)
+        self.use_transparency_model = (value == 1)
 
     @pyqtSlot(int)
     def onTransmittanceChanged(self, value):