diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 2f164bd74687..fdb0f832fade 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -38,7 +38,7 @@
 
 static unsigned long virt_to_hvpfn(void *addr)
 {
-	unsigned long paddr;
+	phys_addr_t paddr;
 
 	if (is_vmalloc_addr(addr))
 		paddr = page_to_phys(vmalloc_to_page(addr)) +