diff --git a/io_anim_acclaim/__init__.py b/io_anim_acclaim/__init__.py
index e47f50feb58c7e84089ba1137914418b166d8872..d929a44c64fd0edc6f1054e220d287239e8af958 100644
--- a/io_anim_acclaim/__init__.py
+++ b/io_anim_acclaim/__init__.py
@@ -399,7 +399,6 @@ class AmcAnimator(bpy.types.Operator):
         bpy.context.scene.frame_set(bpy.context.scene.frame_current)
         context.window_manager.event_timer_remove(self.timer)
         bpy.ops.object.mode_set(mode='OBJECT')
-        return {'CANCELLED'}
 
 
 class AmcImporter(bpy.types.Operator):
diff --git a/io_anim_c3d/__init__.py b/io_anim_c3d/__init__.py
index 0270455281109f80cb52f5e2a9ab165b04e490e5..0f918fdfd8bfbe6be469ca826796822039b429d2 100644
--- a/io_anim_c3d/__init__.py
+++ b/io_anim_c3d/__init__.py
@@ -95,7 +95,6 @@ class C3DAnimateCloud(bpy.types.Operator):
     def cancel(self, context):
         bpy.context.scene.frame_set(bpy.context.scene.frame_current)
         context.window_manager.event_timer_remove(self.timer)
-        return {'CANCELLED'}
 
 
 class C3DImporter(bpy.types.Operator):
diff --git a/space_view3d_screencast_keys.py b/space_view3d_screencast_keys.py
index b93698cbb8afda843311adc720b11797e1e36868..f568c31ab6f6d293a7cd2655ce6c9e0fd2b11beb 100644
--- a/space_view3d_screencast_keys.py
+++ b/space_view3d_screencast_keys.py
@@ -603,7 +603,6 @@ class ScreencastKeysStatus(bpy.types.Operator):
         if context.window_manager.screencast_keys_keys:
             ScreencastKeysStatus.handle_remove(context)
             context.window_manager.screencast_keys_keys = False
-        return {'CANCELLED'}
 
     def invoke(self, context, event):
         if context.area.type == 'VIEW_3D':
diff --git a/system_demo_mode/demo_mode.py b/system_demo_mode/demo_mode.py
index 740dc50a3b7d8c3675501adb768208ba43fe91dc..b7986b73761df3588d36d6c856bf07f5a07f6a4e 100644
--- a/system_demo_mode/demo_mode.py
+++ b/system_demo_mode/demo_mode.py
@@ -404,7 +404,6 @@ class DemoMode(bpy.types.Operator):
         print("func:DemoMode.cancel")
         # disable here means no running on file-load.
         self.cleanup()
-        return {'CANCELLED'}
 
     # call from DemoModeControl
     @classmethod