diff --git a/src/modules/audio_coding/main/source/acm_generic_codec.cc b/src/modules/audio_coding/main/source/acm_generic_codec.cc
index ce0c93c4cd..68d9885a5d 100644
--- a/src/modules/audio_coding/main/source/acm_generic_codec.cc
+++ b/src/modules/audio_coding/main/source/acm_generic_codec.cc
@@ -1152,7 +1152,7 @@ ACMGenericCodec::EnableDTX()
     {
         if(WebRtcCng_CreateEnc(&_ptrDTXInst) < 0)
         {
-            _ptrDTXInst = false;
+            _ptrDTXInst = NULL;
             return -1;
         }
         WebRtc_UWord16 freqHz;