diff --git a/keyboards/hator/rockfall3/htk850/config.h b/keyboards/hator/rockfall3/htk850/config.h
index 0a0539608d6..6615be44be1 100644
--- a/keyboards/hator/rockfall3/htk850/config.h
+++ b/keyboards/hator/rockfall3/htk850/config.h
@@ -36,6 +36,7 @@
 /* UART */
 #define UART_TX_PIN A9
 #define UART_RX_PIN A10
+#define UART_RX_PAL_MODE 7
 
 /* SPI Config for spi flash*/
 #define SPI_DRIVER SPIDQ