diff --git a/firmware/drivers/audio/tlv320.c b/firmware/drivers/audio/tlv320.c
index 3059b5a075..c0f37302fc 100644
--- a/firmware/drivers/audio/tlv320.c
+++ b/firmware/drivers/audio/tlv320.c
@@ -65,7 +65,7 @@ struct tlv320_info
 /* Shadow registers */
 unsigned tlv320_regs[0xf];
 
-void tlv320_write_reg(unsigned reg, unsigned value)
+static void tlv320_write_reg(unsigned reg, unsigned value)
 {
     unsigned char data[2];
 
diff --git a/firmware/drivers/audio/uda1380.c b/firmware/drivers/audio/uda1380.c
index e5481a5cd0..91bc9a1a8e 100644
--- a/firmware/drivers/audio/uda1380.c
+++ b/firmware/drivers/audio/uda1380.c
@@ -68,7 +68,7 @@ int tenthdb2mixer(int db)
 /* Local functions and variables */
 /* ------------------------------------------------- */
 
-int uda1380_write_reg(unsigned char reg, unsigned short value);
+static int uda1380_write_reg(unsigned char reg, unsigned short value);
 unsigned short uda1380_regs[0x30];
 short recgain_mic;
 short recgain_line;
@@ -101,10 +101,9 @@ unsigned short uda1380_defaults[2*NUM_DEFAULT_REGS] =
    REG_AGC,        0
 };
 
-  
 
 /* Returns 0 if register was written or -1 if write failed */
-int uda1380_write_reg(unsigned char reg, unsigned short value)
+static int uda1380_write_reg(unsigned char reg, unsigned short value)
 {
     unsigned char data[3];
 
@@ -172,7 +171,7 @@ void audiohw_mute(bool mute)
 }
 
 /* Returns 0 if successful or -1 if some register failed */
-int audiohw_set_regs(void)
+static int audiohw_set_regs(void)
 {
     int i;
     memset(uda1380_regs, 0, sizeof(uda1380_regs));