diff --git a/boards/arm/kinetis/freedom-k64f/src/freedom-k64f.h b/boards/arm/kinetis/freedom-k64f/src/freedom-k64f.h
index 07e1dfd04d4..37964732dd7 100644
--- a/boards/arm/kinetis/freedom-k64f/src/freedom-k64f.h
+++ b/boards/arm/kinetis/freedom-k64f/src/freedom-k64f.h
@@ -232,6 +232,17 @@
  * Public Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: k64_i2cdev_initialize
+ *
+ * Description:
+ *   Called to configure I2C chip select GPIO pins for the FRDM-K64F board.
+ *
+ ****************************************************************************/
+
+int k64_i2cdev_initialize(void);
+
+
 /****************************************************************************
  * Name: k64_spidev_initialize
  *