diff --git a/tests/generic/223 b/tests/generic/223
index a67b8d58..f150dc93 100755
--- a/tests/generic/223
+++ b/tests/generic/223
@@ -69,7 +69,7 @@ for SUNIT_K in 8 16 32 64 128; do
 			$XFS_IO_PROG -f -c "falloc 0 $SIZE" \
 				$SCRATCH_MNT/file-$FILE-$SIZE-falloc \
 					>> $seqres.full 2>&1
-			$XFS_IO_PROG -f -c "pwrite 0 $SIZE" \
+			$XFS_IO_PROG -f -c "pwrite -b $SIZE 0 $SIZE" \
 				$SCRATCH_MNT/file-$FILE-$SIZE-write \
 					>> $seqres.full 2>&1
 			src/t_stripealign $SCRATCH_MNT/file-$FILE-$SIZE-falloc \
diff --git a/tests/xfs/203 b/tests/xfs/203
index 7e18ca3c..2ac52903 100755
--- a/tests/xfs/203
+++ b/tests/xfs/203
@@ -38,11 +38,11 @@ _write_holes()
 	let fsize=$(($writes * 0x100000))
 
 	# prevent EOF preallocation from affecting results
-	xfs_io -f $file -c "truncate $fsize"
+	$XFS_IO_PROG -f $file -c "truncate $fsize"
 
 	offset=0
 	for i in `seq 0 $writes`; do
-		xfs_io -f $file -c "pwrite -q $offset 64k"
+		$XFS_IO_PROG -f $file -c "pwrite -b 64k -q $offset 64k"
 		let offset=$offset+0x100000
 	done
 }