diff --git a/sdrbase/dsp/inthalfbandfilter.h b/sdrbase/dsp/inthalfbandfilter.h
index cd5343706..a92a59993 100644
--- a/sdrbase/dsp/inthalfbandfilter.h
+++ b/sdrbase/dsp/inthalfbandfilter.h
@@ -572,8 +572,8 @@ protected:
 		iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
 		qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
 
-		sample->setReal(iAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift);
-		sample->setImag(qAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift);
+		sample->setReal(iAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
+		sample->setImag(qAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
 	}
 
 	void doFIR(qint32 *x, qint32 *y)