diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 26c62e0d34e9..1f65795cf5d7 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -113,7 +113,7 @@ static struct io_tlb_pool *xen_swiotlb_find_pool(struct device *dev,
 }
 
 #ifdef CONFIG_X86
-int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
+int __init xen_swiotlb_fixup(void *buf, unsigned long nslabs)
 {
 	int rc;
 	unsigned int order = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT);