diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index d1cf6a1c92a4..7c7b477b0f28 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2224,7 +2224,7 @@ static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
 		retval = -EFAULT;
 		goto done;
 	}
-	if (size & (~PAGE_MASK)) {
+	if (offset_in_page(size)) {
 		retval = -EFAULT;
 		goto done;
 	}