diff --git a/drivers/irqchip/irq-ast2700-intc0.c b/drivers/irqchip/irq-ast2700-intc0.c
index c85b98a19bd4..1e375e9dffae 100644
--- a/drivers/irqchip/irq-ast2700-intc0.c
+++ b/drivers/irqchip/irq-ast2700-intc0.c
@@ -48,9 +48,9 @@
 #define INTC0_INTMX_IER		0x1b00
 #define INTC0_INTMX_ISR		0x1b04
 #define INTC0_INTMX_BANK_SIZE	0x10
-#define INTC0_INTM_BANK_NUM	3
 #define INTC0_IRQS_PER_BANK	32
 #define INTM_IRQS_PER_BANK	10
+#define INTC0_INTM_BANK_NUM	(INTC0_INTM_NUM / INTM_IRQS_PER_BANK)
 #define INTC0_SEL_BASE			0x200
 #define INTC0_SEL_BANK_SIZE		0x4
 #define INTC0_SEL_ROUTE_SIZE	0x100