diff --git a/firmware/drivers/mas.h b/firmware/drivers/mas.h
index 11b24eb6d8..116863f3c5 100644
--- a/firmware/drivers/mas.h
+++ b/firmware/drivers/mas.h
@@ -90,7 +90,6 @@ int mas_readmem(int bank, int addr, unsigned long* dest, int len);
 int mas_writemem(int bank, int addr, unsigned long* src, int len);
 int mas_readreg(int reg);
 int mas_writereg(int reg, unsigned int val);
-int dac_volume(unsigned int volume);
 int mas_direct_config_read(unsigned char reg);
 int mas_direct_config_write(unsigned char reg, unsigned int val);
 int mas_codec_writereg(int reg, unsigned int val);