diff --git a/src/avr/gpio.c b/src/avr/gpio.c
index fdb185627..15aaeae6f 100644
--- a/src/avr/gpio.c
+++ b/src/avr/gpio.c
@@ -438,17 +438,17 @@ spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
     return config;
 }
 
-void spi_prepare(struct spi_config config)
+void
+spi_prepare(struct spi_config config)
 {
+    SPCR = config.spcr;
+    SPSR = config.spsr;
 }
 
 void
 spi_transfer(struct spi_config config, uint8_t receive_data
              , uint8_t len, uint8_t *data)
 {
-    SPCR = config.spcr;
-    SPSR = config.spsr;
-
     if (receive_data) {
         while (len--) {
             SPDR = *data;