diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index 874560fac1..772d891136 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -208,10 +208,10 @@ error:
             flags |= FLV_CODECID_NELLYMOSER            | FLV_SAMPLESSIZE_16BIT;
         break;
     case AV_CODEC_ID_PCM_MULAW:
-        flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
+        flags |= FLV_CODECID_PCM_MULAW | FLV_SAMPLESSIZE_16BIT;
         break;
     case AV_CODEC_ID_PCM_ALAW:
-        flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
+        flags |= FLV_CODECID_PCM_ALAW | FLV_SAMPLESSIZE_16BIT;
         break;
     case 0:
         flags |= par->codec_tag << 4;