diff --git a/phpBB/includes/acp/acp_logs.php b/phpBB/includes/acp/acp_logs.php
index 270cf02be7..ee9d286f34 100644
--- a/phpBB/includes/acp/acp_logs.php
+++ b/phpBB/includes/acp/acp_logs.php
@@ -63,7 +63,7 @@ class acp_logs
 					{
 						$sql_in[] = $mark;
 					}
-					$conditions['log_id'] = $sql_in;
+					$conditions['log_id'] = array('IN' => $sql_in);
 					unset($sql_in);
 				}
 
diff --git a/phpBB/includes/mcp/mcp_logs.php b/phpBB/includes/mcp/mcp_logs.php
index bcaf6277a8..2945e1ec8a 100644
--- a/phpBB/includes/mcp/mcp_logs.php
+++ b/phpBB/includes/mcp/mcp_logs.php
@@ -116,7 +116,7 @@ class mcp_logs
 				{
 					$conditions = array(
 						'forum_id'	=> $forum_list,
-						'log_id'	=> $marked,
+						'log_id'	=> array('IN' => $marked),
 					);
 
 					$phpbb_log->delete('mod', $conditions);