diff --git a/src/rp2_common/hardware_irq/include/hardware/irq.h b/src/rp2_common/hardware_irq/include/hardware/irq.h
index 428f4ad..d82ad54 100644
--- a/src/rp2_common/hardware_irq/include/hardware/irq.h
+++ b/src/rp2_common/hardware_irq/include/hardware/irq.h
@@ -95,8 +95,8 @@
 #define PICO_DEFAULT_IRQ_PRIORITY 0x80
 #endif
 
-#define PICO_LOWEST_IRQ_PRIORITY 0x01
-#define PICO_HIGHEST_IRQ_PRIORITY 0xff
+#define PICO_LOWEST_IRQ_PRIORITY 0xff
+#define PICO_HIGHEST_IRQ_PRIORITY 0x00
 
 // PICO_CONFIG: PICO_SHARED_IRQ_HANDLER_DEFAULT_ORDER_PRIORITY, Set default shared IRQ order priority, default=0x80, group=hardware_irq
 #ifndef PICO_SHARED_IRQ_HANDLER_DEFAULT_ORDER_PRIORITY