diff --git a/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c b/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c
index 96675a8768..4c2b178873 100644
--- a/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c
+++ b/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c
@@ -895,6 +895,10 @@ static int __init pcistub_init(void)
 fs_initcall(pcistub_init);
 #endif
 
+static void pciback_exit(void)
+{
+}
+
 static int __init pciback_init(void)
 {
 	int err;