1 files changed, 1 insertions, 1 deletions

diff --git a/apps/codecs/mp3_enc.c b/apps/codecs/mp3_enc.c
index 18774ef456..9988dd8051 100644
--- a/apps/codecs/mp3_enc.c
+++ b/apps/codecs/mp3_enc.c
@@ -2112,7 +2112,7 @@ STATICIRAM void to_mono_mm(void)
             case 0:
             default:
                 /* mono = (L+R)/2 */
-                m  = r + r + err;
+                m  = l + r + err;
                 err = m & 1;
                 m >>= 1;
                 break;