diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index b7a4bca92c..6b9f1380e5 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.c
@@ -815,7 +815,7 @@ static switch_status_t sofia_read_frame(switch_core_session_t *session, switch_f
 							}
 							
 
-							if (tech_pvt->last_codec_ms && tech_pvt->last_codec_ms == codec_ms) {
+							if (tech_pvt->last_codec_ms && tech_pvt->last_codec_ms != codec_ms) {
 								tech_pvt->mismatch_count++;
 							}