diff --git a/sw/airborne/mcu_periph/i2c.c b/sw/airborne/mcu_periph/i2c.c
index d01c143638..897278d41c 100644
--- a/sw/airborne/mcu_periph/i2c.c
+++ b/sw/airborne/mcu_periph/i2c.c
@@ -69,32 +69,32 @@ void i2c_init(struct i2c_periph* p) {
 }
 
 
-void i2c_transmit(struct i2c_periph* p, struct i2c_transaction* t,
+bool_t i2c_transmit(struct i2c_periph* p, struct i2c_transaction* t,
                   uint8_t s_addr, uint8_t len)
 {
   t->type = I2CTransTx;
   t->slave_addr = s_addr;
   t->len_w = len;
   t->len_r = 0;
-  i2c_submit(p, t);
+  return i2c_submit(p, t);
 }
 
-void i2c_receive(struct i2c_periph* p, struct i2c_transaction* t,
+bool_t i2c_receive(struct i2c_periph* p, struct i2c_transaction* t,
                  uint8_t s_addr, uint16_t len)
 {
   t->type = I2CTransRx;
   t->slave_addr = s_addr;
   t->len_w = 0;
   t->len_r = len;
-  i2c_submit(p, t);
+  return i2c_submit(p, t);
 }
 
-void i2c_transceive(struct i2c_periph* p, struct i2c_transaction* t,
+bool_t i2c_transceive(struct i2c_periph* p, struct i2c_transaction* t,
                     uint8_t s_addr, uint8_t len_w, uint16_t len_r)
 {
   t->type = I2CTransTxRx;
   t->slave_addr = s_addr;
   t->len_w = len_w;
   t->len_r = len_r;
-  i2c_submit(p, t);
+  return i2c_submit(p, t);
 }
diff --git a/sw/airborne/mcu_periph/i2c.h b/sw/airborne/mcu_periph/i2c.h
index 71ce56d095..6b22b0e9a9 100644
--- a/sw/airborne/mcu_periph/i2c.h
+++ b/sw/airborne/mcu_periph/i2c.h
@@ -176,15 +176,17 @@ extern void   i2c_event(void);
  * Convenience functions.
  * Usually these are preferred over i2c_submit,
  * as they explicitly set the transaction type again.
+ *
+ * Return FALSE if submitting the transaction failed.
  */
-extern void i2c_transmit(struct i2c_periph* p, struct i2c_transaction* t,
-                         uint8_t s_addr, uint8_t len);
+extern bool_t i2c_transmit(struct i2c_periph* p, struct i2c_transaction* t,
+                           uint8_t s_addr, uint8_t len);
 
-extern void i2c_receive(struct i2c_periph* p, struct i2c_transaction* t,
-                        uint8_t s_addr, uint16_t len);
+extern bool_t i2c_receive(struct i2c_periph* p, struct i2c_transaction* t,
+                          uint8_t s_addr, uint16_t len);
 
-extern void i2c_transceive(struct i2c_periph* p, struct i2c_transaction* t,
-                           uint8_t s_addr, uint8_t len_w, uint16_t len_r);
+extern bool_t i2c_transceive(struct i2c_periph* p, struct i2c_transaction* t,
+                             uint8_t s_addr, uint8_t len_w, uint16_t len_r);
 
 /** @}*/
 /** @}*/