diff --git a/extensions/ilastik/models.py b/extensions/ilastik/models.py
index 65057cca4017b2759b5c0d7b823a6501647faae2..1413456f633d188ad646376605749861ba904066 100644
--- a/extensions/ilastik/models.py
+++ b/extensions/ilastik/models.py
@@ -68,7 +68,7 @@ class IlastikPixelClassifierModel(IlastikImageToImageModel):
         ]
         pxmaps = self.shell.workflow.batchProcessingApplet.run_export(dsi, export_to_array=True) # [z x h x w x n]
 
-        assert(len(pxmaps) == 1, 'ilastik generated more than one pixel map')
+        assert len(pxmaps) == 1, 'ilastik generated more than one pixel map'
 
         yxcz = np.moveaxis(
             pxmaps[0],