diff --git a/qutebrowser/browser/tab.py b/qutebrowser/browser/tab.py
index f79598bb7..d1d049d74 100644
--- a/qutebrowser/browser/tab.py
+++ b/qutebrowser/browser/tab.py
@@ -238,7 +238,7 @@ class AbstractCaret(QObject):
         modeman.entered.connect(self.on_mode_entered)
         modeman.left.connect(self.on_mode_left)
 
-    def on_mode_entered(self):
+    def on_mode_entered(self, mode):
         raise NotImplementedError
 
     def on_mode_left(self):
diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 5ef430b82..014472a3c 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -54,7 +54,7 @@ class WebEngineCaret(tab.AbstractCaret):
         pass
 
     @pyqtSlot(usertypes.KeyMode)
-    def on_mode_left(self, mode):
+    def on_mode_left(self):
         ## TODO
         pass