1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/zorro.h b/include/linux/zorro.h
index 7bf9db525e9..dff42025649 100644
--- a/include/linux/zorro.h
+++ b/include/linux/zorro.h
@@ -187,7 +187,7 @@ extern struct zorro_dev *zorro_find_device(zorro_id id,
 
 #define zorro_resource_start(z) ((z)->resource.start)
 #define zorro_resource_end(z)   ((z)->resource.end)
-#define zorro_resource_len(z)   ((z)->resource.end-(z)->resource.start+1)
+#define zorro_resource_len(z)   (resource_size(&(z)->resource))
 #define zorro_resource_flags(z) ((z)->resource.flags)
 
 #define zorro_request_device(z, name) \