diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index c63579db5a2c..3efa58b1331f 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -4802,7 +4802,14 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int count,
 	la = IDX_TO_OFF(ma[count - 1]->pindex);
 	if (la >= object->un_pager.vnp.vnp_size)
 		return (VM_PAGER_BAD);
-	lpart = la + PAGE_SIZE > object->un_pager.vnp.vnp_size;
+
+	/*
+	 * Change the meaning of la from where the last requested page starts
+	 * to where it ends, because that's the end of the requested region
+	 * and the start of the potential read-ahead region.
+	 */
+	la += PAGE_SIZE;
+	lpart = la > object->un_pager.vnp.vnp_size;
 	bo_bs = get_blksize(vp, get_lblkno(vp, IDX_TO_OFF(ma[0]->pindex)));
 
 	/*