diff --git a/include/libopencm3/lpc43xx/ssp.h b/include/libopencm3/lpc43xx/ssp.h
index b03c9176..dbda6917 100644
--- a/include/libopencm3/lpc43xx/ssp.h
+++ b/include/libopencm3/lpc43xx/ssp.h
@@ -194,8 +194,6 @@ void ssp_init(ssp_num_t ssp_num,
 				ssp_master_slave_t master_slave,
 				ssp_slave_option_t slave_option);
 
-u16 ssp_transfer(ssp_num_t ssp_num, u16 data);
-
 uint16_t ssp_transfer(ssp_num_t ssp_num, uint16_t data);
 
 END_DECLS
diff --git a/lib/lpc43xx/ssp.c b/lib/lpc43xx/ssp.c
index edf547b6..e0f3e9b3 100644
--- a/lib/lpc43xx/ssp.c
+++ b/lib/lpc43xx/ssp.c
@@ -135,11 +135,6 @@ uint16_t ssp_transfer(ssp_num_t ssp_num, uint16_t data)
 	return SSP_DR(ssp_port);
 }
 
-uint16_t ssp_transfer(ssp_num_t ssp_num, uint16_t data)
-{
-  ssp_write(ssp_num, data);
-  return ssp_read(ssp_num);
-}
 
 /**@}*/