1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/export/mp3_playback.h b/firmware/export/mp3_playback.h
index 2370614e19..b4719b7d9b 100644
--- a/firmware/export/mp3_playback.h
+++ b/firmware/export/mp3_playback.h
@@ -36,7 +36,7 @@ int mpeg_sound_max(int setting);
 int mpeg_sound_default(int setting);
 void mpeg_sound_channel_config(int configuration);
 int mpeg_val2phys(int setting, int value);
-char *mpeg_sound_unit(int setting);
+const char *mpeg_sound_unit(int setting);
 int mpeg_sound_numdecimals(int setting);
 int mpeg_sound_steps(int setting);
 #if defined(HAVE_MAS3587F) || defined(SIMULATOR)