diff --git a/apps/codecs/mp3_enc.c b/apps/codecs/mp3_enc.c
index 17d980fa39..c66d755f08 100644
--- a/apps/codecs/mp3_enc.c
+++ b/apps/codecs/mp3_enc.c
@@ -2093,8 +2093,8 @@ STATICIRAM void to_mono_mm(void)
 
     inline void to_mono(uint16_t **samp)
     {
-        int16_t r = **samp;
-        int16_t l = *(*samp+1);
+        int16_t l = **samp;
+        int16_t r = *(*samp+1);
         int32_t m;
 
         switch(cfg.rec_mono_mode)