diff --git a/util/inteltool/inteltool.c b/util/inteltool/inteltool.c
index f32ec73..a416106 100644
--- a/util/inteltool/inteltool.c
+++ b/util/inteltool/inteltool.c
@@ -85,7 +85,7 @@
 #ifndef __DARWIN__
 static int fd_mem;
 
-void *map_physical(unsigned long phys_addr, size_t len)
+void *map_physical(uint64_t phys_addr, size_t len)
 {
 	void *virt_addr;