diff --git a/src/client/dfs/obj.c b/src/client/dfs/obj.c
index 4801e381334..024a230268d 100644
--- a/src/client/dfs/obj.c
+++ b/src/client/dfs/obj.c
@@ -854,8 +854,10 @@ ostatx_cb(tse_task_t *task, void *data)
 		D_GOTO(out, rc = daos_errno2der(rc));
 
 	if (S_ISREG(args->obj->mode)) {
-		args->stbuf->st_size   = op_args->array_stbuf.st_size;
-		args->stbuf->st_blocks = (args->stbuf->st_size + (1 << 9) - 1) >> 9;
+		args->stbuf->st_size    = op_args->array_stbuf.st_size;
+		args->stbuf->st_blocks  = (args->stbuf->st_size + (1 << 9) - 1) >> 9;
+		args->stbuf->st_blksize = op_args->entry.chunk_size ? op_args->entry.chunk_size :
+			args->dfs->attr.da_chunk_size;
 	} else if (S_ISDIR(args->obj->mode)) {
 		args->stbuf->st_size = sizeof(op_args->entry);
 	} else if (S_ISLNK(args->obj->mode)) {
diff --git a/src/tests/suite/dfs_unit_test.c b/src/tests/suite/dfs_unit_test.c
index cbb827112f7..a5feb6c3ca5 100644
--- a/src/tests/suite/dfs_unit_test.c
+++ b/src/tests/suite/dfs_unit_test.c
@@ -1056,6 +1056,7 @@ dfs_test_rename(void **state)
 	rc = dfs_ostatx(dfs_mt, obj2, &stbuf, NULL);
 	assert_int_equal(rc, 0);
 	assert_true(stbuf.st_size == 128);
+	assert_int_equal(stbuf.st_blksize, DFS_DEFAULT_CHUNK_SIZE);
 
 	rc = dfs_chmod(dfs_mt, NULL, f1, S_IFREG | S_IRUSR | S_IWUSR);
 	assert_int_equal(rc, 0);