diff --git a/blog/lib.php b/blog/lib.php
index ec91cf01388..a1cbf36e147 100755
--- a/blog/lib.php
+++ b/blog/lib.php
@@ -235,7 +235,7 @@ function blog_sync_external_entries($externalblog) {
 function blog_delete_external_entries($externalblog) {
     global $DB;
     require_capability('moodle/blog:manageexternal', get_context_instance(CONTEXT_SYSTEM));
-    $DB->delete_records('post', array('content' => $externalblog->id, 'module' => 'blog_external'));
+    $DB->delete_records_select('post', 'content='.$DB->sql_compare_text($externalblog->id)." and module='blog_external'");
 }
 
 /**