diff --git a/src/sdr/SDRPostThread.cpp b/src/sdr/SDRPostThread.cpp
index e0ab675..788ea94 100644
--- a/src/sdr/SDRPostThread.cpp
+++ b/src/sdr/SDRPostThread.cpp
@@ -33,6 +33,7 @@ SDRPostThread::SDRPostThread() : IOThread(), buffers("SDRPostThreadBuffers"), vi
 
 
 SDRPostThread::~SDRPostThread() {
+    iirfilt_crcf_destroy(dcFilter);
 }