diff --git a/morituri/common/encode.py b/morituri/common/encode.py
index f00fc1b..5b0967a 100644
--- a/morituri/common/encode.py
+++ b/morituri/common/encode.py
@@ -297,7 +297,7 @@ class EncodeTask(ctask.GstPipelineTask):
             # self.peak = 0.0
 
 
-class TagReadTask(gstreamer.GstPipelineTask):
+class TagReadTask(ctask.GstPipelineTask):
     """
     I am a task that reads tags.
 
@@ -334,7 +334,7 @@ class TagReadTask(gstreamer.GstPipelineTask):
         self.taglist = taglist
 
 
-class TagWriteTask(task.Task):
+class TagWriteTask(ctask.LoggableTask):
     """
     I am a task that retags an encoded file.
     """
@@ -411,7 +411,7 @@ class TagWriteTask(task.Task):
         task.Task.stop(self)
 
 
-class SafeRetagTask(task.MultiSeparateTask):
+class SafeRetagTask(ctask.LoggableMultiSeparateTask):
     """
     I am a task that retags an encoded file safely in place.
     First of all, if the new tags are the same as the old ones, it doesn't
diff --git a/morituri/common/task.py b/morituri/common/task.py
index f0591d5..a40acc2 100644
--- a/morituri/common/task.py
+++ b/morituri/common/task.py
@@ -16,6 +16,12 @@ class SyncRunner(log.Loggable, task.SyncRunner):
     pass
 
 
+class LoggableTask(log.Loggable, task.Task):
+    pass
+
+class LoggableMultiSeparateTask(log.Loggable, task.MultiSeparateTask):
+    pass
+
 class GstPipelineTask(log.Loggable, gstreamer.GstPipelineTask):
     pass