1 files changed, 4 insertions, 4 deletions
diff --git a/os/io/spi.h b/os/io/spi.h
index 309769e4d..3bd21e71b 100644
--- a/os/io/spi.h
+++ b/os/io/spi.h
@@ -59,10 +59,10 @@ extern "C" {
   void spiStop(SPIDriver *spip);
   void spiSelect(SPIDriver *spip);
   void spiUnselect(SPIDriver *spip);
-  msg_t spiIgnore(SPIDriver *spip, size_t n);
-  msg_t spiExchange(SPIDriver *spip, size_t n, void *txbuf, void *rxbuf);
-  msg_t spiSend(SPIDriver *spip, size_t n, void *txbuf);
-  msg_t spiReceive(SPIDriver *spip, size_t n, void *rxbuf);
+  void spiIgnore(SPIDriver *spip, size_t n);
+  void spiExchange(SPIDriver *spip, size_t n, void *txbuf, void *rxbuf);
+  void spiSend(SPIDriver *spip, size_t n, void *txbuf);
+  void spiReceive(SPIDriver *spip, size_t n, void *rxbuf);
 #if SPI_USE_MUTUAL_EXCLUSION
   void spiAcquireBus(SPIDriver *spip);
   void spiReleaseBus(SPIDriver *spip);