diff --git a/arch/mips/lasat/interrupt.c b/arch/mips/lasat/interrupt.c
index cfeab669782f04ec30e472f2b4b39476980bedbf..a56c15026965ef06f859eac8844af98d6b48a8e0 100644
--- a/arch/mips/lasat/interrupt.c
+++ b/arch/mips/lasat/interrupt.c
@@ -34,11 +34,13 @@ static volatile int lasat_int_mask_shift;
 
 void disable_lasat_irq(unsigned int irq_nr)
 {
+	irq_nr -= LASAT_IRQ_BASE;
 	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
 }
 
 void enable_lasat_irq(unsigned int irq_nr)
 {
+	irq_nr -= LASAT_IRQ_BASE;
 	*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
 }
 
diff --git a/include/asm-mips/lasat/serial.h b/include/asm-mips/lasat/serial.h
index bafe68b10614f7a20cb2d598414b0524944ab7dc..1c37d70579b817a98e1cdadea91be801264e8339 100644
--- a/include/asm-mips/lasat/serial.h
+++ b/include/asm-mips/lasat/serial.h
@@ -4,10 +4,10 @@
 #define LASAT_BASE_BAUD_100 		(7372800 / 16)
 #define LASAT_UART_REGS_BASE_100	0x1c8b0000
 #define LASAT_UART_REGS_SHIFT_100	2
-#define LASATINT_UART_100		8
+#define LASATINT_UART_100		16
 
 /* * LASAT 200 boards serial configuration */
 #define LASAT_BASE_BAUD_200		(100000000 / 16 / 12)
 #define LASAT_UART_REGS_BASE_200	(Vrc5074_PHYS_BASE + 0x0300)
 #define LASAT_UART_REGS_SHIFT_200	3
-#define LASATINT_UART_200		13
+#define LASATINT_UART_200		21