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-rw-r--r--modules/book.module2
1 files changed, 1 insertions, 1 deletions
diff --git a/modules/book.module b/modules/book.module
index a515fa0e7..cbe8f1635 100644
--- a/modules/book.module
+++ b/modules/book.module
@@ -662,7 +662,7 @@ function book_render() {
*/
function book_export($type = 'html', $nid = 0) {
global $base_url;
- $type = strtolower($type);
+ $type = drupal_strtolower($type);
$depth = _book_get_depth($nid);
switch ($type) {
case 'docbook':