diff --git a/csdr/chain/digiham.py b/csdr/chain/digiham.py
index fbbd91af..abf426bc 100644
--- a/csdr/chain/digiham.py
+++ b/csdr/chain/digiham.py
@@ -1,7 +1,7 @@
 from csdr.chain.demodulator import BaseDemodulatorChain, FixedAudioRateChain, FixedIfSampleRateChain, DialFrequencyReceiver, MetaProvider, SlotFilterChain, DemodulatorError, ServiceDemodulator
-from pycsdr.modules import FmDemod, Agc, Writer, Buffer
+from pycsdr.modules import FmDemod, Agc, Writer, Buffer, DcBlock
 from pycsdr.types import Format
-from digiham.modules import DstarDecoder, DcBlock, FskDemodulator, GfskDemodulator, DigitalVoiceFilter, MbeSynthesizer, NarrowRrcFilter, NxdnDecoder, DmrDecoder, WideRrcFilter, YsfDecoder, PocsagDecoder
+from digiham.modules import DstarDecoder, FskDemodulator, GfskDemodulator, DigitalVoiceFilter, MbeSynthesizer, NarrowRrcFilter, NxdnDecoder, DmrDecoder, WideRrcFilter, YsfDecoder, PocsagDecoder
 from digiham.ambe import Modes, ServerError
 from owrx.meta import MetaParser
 from owrx.pocsag import PocsagParser
diff --git a/csdr/chain/m17.py b/csdr/chain/m17.py
index a54ecd7d..937103c3 100644
--- a/csdr/chain/m17.py
+++ b/csdr/chain/m17.py
@@ -1,8 +1,7 @@
 from csdr.chain.demodulator import BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain, MetaProvider
 from csdr.module.m17 import M17Module
-from pycsdr.modules import FmDemod, Limit, Convert, Writer
+from pycsdr.modules import FmDemod, Limit, Convert, Writer, DcBlock
 from pycsdr.types import Format
-from digiham.modules import DcBlock
 
 
 class M17(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain, MetaProvider):