diff --git a/ports/renesas-ra/ra/ra_config.h b/ports/renesas-ra/ra/ra_config.h
index a2df775c89..a9d4bb803d 100644
--- a/ports/renesas-ra/ra/ra_config.h
+++ b/ports/renesas-ra/ra/ra_config.h
@@ -26,6 +26,7 @@
 #define RA_RA_CONFIG_H_
 
 #include <stdint.h>
+#include "py/mpconfig.h"
 
 #if defined(RA4M1) | defined(RA4W1)
 #define SCI_CH_MAX      10
diff --git a/ports/renesas-ra/ra/ra_init.c b/ports/renesas-ra/ra/ra_init.c
index c9b78e0dd1..a784aec707 100644
--- a/ports/renesas-ra/ra/ra_init.c
+++ b/ports/renesas-ra/ra/ra_init.c
@@ -30,7 +30,7 @@
 
 void ra_init(void) {
     ra_int_init();
-    SysTick_Config(PCLK / 1000);
+    SysTick_Config(MICROPY_HW_MCU_SYSCLK / 1000);
     internal_flash_init();
 }