diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index e98b35c7470..8b9c2c9490e 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -1357,7 +1357,7 @@ U_BOOT_CMD(
 );
 
 #if defined(CONFIG_I2C_MUX)
-int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
+static int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
 {
 	I2C_MUX_DEVICE	*devtmp = i2c_mux_devices;
 
diff --git a/include/i2c.h b/include/i2c.h
index 31088b675a3..d828964256e 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -127,8 +127,6 @@ typedef struct _mux_device {
 	struct _mux_device	*next;
 } I2C_MUX_DEVICE;
 
-int	i2c_mux_add_device(I2C_MUX_DEVICE *dev);
-
 I2C_MUX_DEVICE	*i2c_mux_search_device(int id);
 I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
 int i2x_mux_select_mux(int bus);