diff --git a/sw/airborne/subsystems/chibios-libopencm3/chibios_sdlog.c b/sw/airborne/subsystems/chibios-libopencm3/chibios_sdlog.c
index aaef1b46ae..3d3122dc71 100644
--- a/sw/airborne/subsystems/chibios-libopencm3/chibios_sdlog.c
+++ b/sw/airborne/subsystems/chibios-libopencm3/chibios_sdlog.c
@@ -87,8 +87,8 @@ bool_t chibios_logInit(const bool_t binaryFile)
   chibios_sdlog.device.check_free_space = (check_free_space_t) sdlog_check_free_space;
   chibios_sdlog.device.transmit = (transmit_t) sdlog_transmit;
   chibios_sdlog.device.send_message = (send_message_t) sdlog_send;
-  chibios_sdlog.device.char_available = (char_available_t) null; // read only
-  chibios_sdlog.device.getchar = (getchar_t) null; // read only
+  chibios_sdlog.device.char_available = (char_available_t) null_function; // read only
+  chibios_sdlog.device.getchar = (getchar_t) null_function; // read only
 
   if (sdLogInit (NULL) != SDLOG_OK)
     goto error;