diff --git a/modules/book.module b/modules/book.module
index 781e3ac0810..346bf66bd1e 100644
--- a/modules/book.module
+++ b/modules/book.module
@@ -202,7 +202,7 @@ function book_insert($node) {
  */
 function book_update($node) {
   if ($node->revision) {
-    db_query("INSERT INTO {book} (nid, vid, parent, weight) VALUES (%d, %d, %d, %d, '%s')", $node->nid, $node->vid, $node->parent, $node->weight);
+    db_query("INSERT INTO {book} (nid, vid, parent, weight) VALUES (%d, %d, %d, %d)", $node->nid, $node->vid, $node->parent, $node->weight);
   }
   else {
     db_query("UPDATE {book} SET parent = %d, weight = %d WHERE vid = %d", $node->parent, $node->weight, $node->vid);
diff --git a/modules/book/book.module b/modules/book/book.module
index 781e3ac0810..346bf66bd1e 100644
--- a/modules/book/book.module
+++ b/modules/book/book.module
@@ -202,7 +202,7 @@ function book_insert($node) {
  */
 function book_update($node) {
   if ($node->revision) {
-    db_query("INSERT INTO {book} (nid, vid, parent, weight) VALUES (%d, %d, %d, %d, '%s')", $node->nid, $node->vid, $node->parent, $node->weight);
+    db_query("INSERT INTO {book} (nid, vid, parent, weight) VALUES (%d, %d, %d, %d)", $node->nid, $node->vid, $node->parent, $node->weight);
   }
   else {
     db_query("UPDATE {book} SET parent = %d, weight = %d WHERE vid = %d", $node->parent, $node->weight, $node->vid);