diff --git a/arch/arm/src/rp2040/rp2040_xosc.c b/arch/arm/src/rp2040/rp2040_xosc.c
index a2492a2dfea..6f8e24e531c 100644
--- a/arch/arm/src/rp2040/rp2040_xosc.c
+++ b/arch/arm/src/rp2040/rp2040_xosc.c
@@ -80,7 +80,7 @@ void rp2040_xosc_init(void)
 
   /* Set xosc startup delay */
 
-  uint32_t startup_delay = (((12 * MHZ) / 1000) + 128) / 256;
+  uint32_t startup_delay = ((BOARD_XOSC_FREQ / 1000) + 128) / 256;
   putreg32(startup_delay, RP2040_XOSC_STARTUP);
 
   /* Set the enable bit now that we have set freq range and startup delay */
diff --git a/arch/arm/src/rp23xx/rp23xx_xosc.c b/arch/arm/src/rp23xx/rp23xx_xosc.c
index 0da0876e8b5..7bd7b3a8f00 100644
--- a/arch/arm/src/rp23xx/rp23xx_xosc.c
+++ b/arch/arm/src/rp23xx/rp23xx_xosc.c
@@ -78,7 +78,7 @@ void rp23xx_xosc_init(void)
 
   /* Set xosc startup delay */
 
-  uint32_t startup_delay = (((12 * MHZ) / 1000) + 128) / 256;
+  uint32_t startup_delay = ((BOARD_XOSC_FREQ / 1000) + 128) / 256;
   putreg32(startup_delay, RP23XX_XOSC_STARTUP);
 
   /* Set the enable bit now that we have set freq range and startup delay */