diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 820f11c..87f72be 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -6251,7 +6251,7 @@
 		return __this_address;
 
 	if (rtfile && whichfork == XFS_DATA_FORK) {
-		if (!xfs_verify_rtext(mp, irec->br_startblock,
+		if (!xfs_verify_rtbext(mp, irec->br_startblock,
 					  irec->br_blockcount))
 			return __this_address;
 	} else {
diff --git a/libxfs/xfs_types.c b/libxfs/xfs_types.c
index d20d9a5..f5eab88 100644
--- a/libxfs/xfs_types.c
+++ b/libxfs/xfs_types.c
@@ -147,10 +147,10 @@
 
 /* Verify that a realtime device extent is fully contained inside the volume. */
 bool
-xfs_verify_rtext(
+xfs_verify_rtbext(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno,
-	xfs_rtblock_t		len)
+	xfs_filblks_t		len)
 {
 	if (rtbno + len <= rtbno)
 		return false;
diff --git a/libxfs/xfs_types.h b/libxfs/xfs_types.h
index a2fb880..532447a 100644
--- a/libxfs/xfs_types.h
+++ b/libxfs/xfs_types.h
@@ -240,8 +240,8 @@
 bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
 bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino);
 bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
-bool xfs_verify_rtext(struct xfs_mount *mp, xfs_rtblock_t rtbno,
-		xfs_rtblock_t len);
+bool xfs_verify_rtbext(struct xfs_mount *mp, xfs_rtblock_t rtbno,
+		xfs_filblks_t len);
 bool xfs_verify_icount(struct xfs_mount *mp, unsigned long long icount);
 bool xfs_verify_dablk(struct xfs_mount *mp, xfs_fileoff_t off);
 void xfs_icount_range(struct xfs_mount *mp, unsigned long long *min,