diff --git a/platforms/chibios/drivers/uart.c b/platforms/chibios/drivers/uart.c
index dbe991efa3..4884d7024f 100644
--- a/platforms/chibios/drivers/uart.c
+++ b/platforms/chibios/drivers/uart.c
@@ -44,7 +44,7 @@ void uart_init(uint32_t baud) {
 }
 
 void uart_write(uint8_t data) {
-    sdPut(&SERIAL_DRIVER, c);
+    sdPut(&SERIAL_DRIVER, data);
 }
 
 uint8_t uart_read(void) {