diff --git a/CHANGELOG b/CHANGELOG
index 30b5a4b..605c23c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+0.20.2
+ - ref: remove __init__ from SegmentThresh
 0.20.1
  - fix: relative basin locations not written correctly
  - enh: increase deque size threshold for waiting for writer
diff --git a/src/dcnum/logic/ctrl.py b/src/dcnum/logic/ctrl.py
index a2a77a2..09fd36e 100644
--- a/src/dcnum/logic/ctrl.py
+++ b/src/dcnum/logic/ctrl.py
@@ -666,7 +666,6 @@ def task_segment_extract(self):
         num_extractors = max(1, num_extractors)
         num_segmenters = max(1, num_segmenters)
         self.job.kwargs["segmenter_kwargs"]["num_workers"] = num_segmenters
-
         slot_chunks = mp_spawn.Array("i", num_slots)
         slot_states = mp_spawn.Array("u", num_slots)
 
diff --git a/src/dcnum/segm/segm_thresh.py b/src/dcnum/segm/segm_thresh.py
index dc3837e..6c8963b 100644
--- a/src/dcnum/segm/segm_thresh.py
+++ b/src/dcnum/segm/segm_thresh.py
@@ -10,18 +10,6 @@ class SegmentThresh(CPUSegmenter):
     }
     requires_background_correction = True
 
-    def __init__(self, thresh=-6, *args, **kwargs):
-        """Simple image thresholding segmentation
-
-        Parameters
-        ----------
-        thresh: int
-            grayscale threshold value for creating the mask image;
-            For a background-corrected image, pixels with values below
-            this value are considered to be part of the mask.
-        """
-        super(SegmentThresh, self).__init__(thresh=thresh, *args, **kwargs)
-
     @staticmethod
     def segment_approach(image, *,
                          thresh: float = -6):
diff --git a/tests/test_meta_ppid_segm.py b/tests/test_meta_ppid_segm.py
index 96fe437..8b7aa37 100644
--- a/tests/test_meta_ppid_segm.py
+++ b/tests/test_meta_ppid_segm.py
@@ -1,3 +1,4 @@
+from dcnum.meta import ppid
 from dcnum import segm
 
 import pytest
@@ -26,6 +27,22 @@ def test_ppid_decoding_thresh_check_kwargs():
     assert kwargs["kwargs_mask"]["closing_disk"] == 3
 
 
+def test_ppid_kwargs_to_ppid():
+    """Make sure that subclasses correctly implement __init__ (if they do)"""
+    segm_dict = segm.get_available_segmenters()
+    for segm_key in segm_dict:
+        segm_cls = segm_dict[segm_key]
+        inst = segm_cls()
+        kwargs = inst.kwargs
+        kwargs["num_workers"] = 2
+        ppid.kwargs_to_ppid(
+            cls=segm_cls,
+            method="segment_approach",
+            kwargs=kwargs,
+            allow_invalid_keys=False,
+        )
+
+
 @pytest.mark.parametrize("segm_code", segm.get_available_segmenters().keys())
 def test_ppid_required_method_definitions(segm_code):
     segm_class = segm.get_available_segmenters()[segm_code]