diff --git a/firmware/drivers/audio/wm8721.c b/firmware/drivers/audio/wm8721.c
index 60c4e66c76..141224a65b 100644
--- a/firmware/drivers/audio/wm8721.c
+++ b/firmware/drivers/audio/wm8721.c
@@ -66,19 +66,6 @@ int tenthdb2master(int db)
     }
 }
 
-/* convert tenth of dB volume (-780..0) to mixer volume register value */
-int tenthdb2mixer(int db)
-{
-    if (db < -660)                 /* 1.5 dB steps */
-        return (2640 - db) / 15;
-    else if (db < -600)            /* 0.75 dB steps */
-        return (990 - db) * 2 / 15;
-    else if (db < -460)            /* 0.5 dB steps */
-        return (460 - db) / 5; 
-    else                           /* 0.25 dB steps */
-        return -db * 2 / 5;
-}
-
 void audiohw_mute(bool mute)
 {
     if (mute)
diff --git a/firmware/drivers/audio/wm8731.c b/firmware/drivers/audio/wm8731.c
index 59fa4cffcf..a1149c3d2e 100644
--- a/firmware/drivers/audio/wm8731.c
+++ b/firmware/drivers/audio/wm8731.c
@@ -98,19 +98,6 @@ int tenthdb2master(int db)
     }
 }
 
-/* convert tenth of dB volume (-780..0) to mixer volume register value */
-int tenthdb2mixer(int db)
-{
-    if (db < -660)                 /* 1.5 dB steps */
-        return (2640 - db) / 15;
-    else if (db < -600)            /* 0.75 dB steps */
-        return (990 - db) * 2 / 15;
-    else if (db < -460)            /* 0.5 dB steps */
-        return (460 - db) / 5; 
-    else                           /* 0.25 dB steps */
-        return -db * 2 / 5;
-}
-
 int sound_val2phys(int setting, int value)
 {
     int result;
diff --git a/firmware/export/wm8721.h b/firmware/export/wm8721.h
index 9aab1b760a..3611e4d6ee 100644
--- a/firmware/export/wm8721.h
+++ b/firmware/export/wm8721.h
@@ -27,7 +27,6 @@
 #define VOLUME_MAX  60
 
 extern int tenthdb2master(int db);
-extern int tenthdb2mixer(int db);
 
 extern void audiohw_set_master_vol(int vol_l, int vol_r);
 extern void audiohw_set_nsorder(int order);
diff --git a/firmware/export/wm8731.h b/firmware/export/wm8731.h
index 27c11434bb..f55c3af002 100644
--- a/firmware/export/wm8731.h
+++ b/firmware/export/wm8731.h
@@ -27,7 +27,6 @@
 #define VOLUME_MAX  60
 
 extern int tenthdb2master(int db);
-extern int tenthdb2mixer(int db);
 
 extern void audiohw_set_master_vol(int vol_l, int vol_r);
 extern void audiohw_set_nsorder(int order);