diff --git a/hw/mips_malta.c b/hw/mips_malta.c
index 4752bb2..337a2b4 100644
--- a/hw/mips_malta.c
+++ b/hw/mips_malta.c
@@ -854,7 +854,8 @@ void mips_malta_init (ram_addr_t ram_size,
     be = 0;
 #endif
     /* FPGA */
-    malta_fpga_init(system_memory, FPGA_ADDRESS, env->irq[2], serial_hds[2]);
+    /* The CBUS UART is attached to the MIPS CPU INT2 pin, ie interrupt 4 */
+    malta_fpga_init(system_memory, FPGA_ADDRESS, env->irq[4], serial_hds[2]);
 
     /* Load firmware in flash / BIOS. */
     dinfo = drive_get(IF_PFLASH, 0, fl_idx);