diff --git a/drivers/sensors/max6675.c b/drivers/sensors/max6675.c
index 1a97df163c1..0d205a049b8 100644
--- a/drivers/sensors/max6675.c
+++ b/drivers/sensors/max6675.c
@@ -80,8 +80,8 @@ struct max6675_dev_s
  * Private Function Prototypes
  ****************************************************************************/
 
-static void    max6675_lock(FAR struct spi_dev_s *spi)
-static void    max6675_unlock(FAR struct spi_dev_s *spi)
+static void    max6675_lock(FAR struct spi_dev_s *spi);
+static void    max6675_unlock(FAR struct spi_dev_s *spi);
 
 /* Character driver methods */