diff --git a/hw/prep_pci.c b/hw/prep_pci.c
index 2a1d0f9..2d8a0fa 100644
--- a/hw/prep_pci.c
+++ b/hw/prep_pci.c
@@ -124,8 +124,10 @@
     return (irq_num + (pci_dev->devfn >> 3)) & 1;
 }
 
-static void prep_set_irq(qemu_irq *pic, int irq_num, int level)
+static void prep_set_irq(void *opaque, int irq_num, int level)
 {
+    qemu_irq *pic = opaque;
+
     qemu_set_irq(pic[(irq_num & 1) ? 11 : 9] , level);
 }