diff --git a/phpBB/includes/db/dbal.php b/phpBB/includes/db/dbal.php
index db469ed969..cf54d455f7 100644
--- a/phpBB/includes/db/dbal.php
+++ b/phpBB/includes/db/dbal.php
@@ -521,6 +521,18 @@ class dbal
 		return $expression;
 	}
 
+	/**
+	* Run LOWER() on DB column of type text (i.e. neither varchar nor char).
+	*
+	* @param string $column_name	The column name to use
+	*
+	* @return string				A SQL statement like "LOWER($column_name)"
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER($column_name)";
+	}
+
 	/**
 	* Run more than one insert statement.
 	*
diff --git a/phpBB/includes/db/mssql.php b/phpBB/includes/db/mssql.php
index fd11dbad3c..abeabc389f 100644
--- a/phpBB/includes/db/mssql.php
+++ b/phpBB/includes/db/mssql.php
@@ -324,6 +324,14 @@ class dbal_mssql extends dbal
 		return str_replace(array("'", "\0"), array("''", ''), $msg);
 	}
 
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private
diff --git a/phpBB/includes/db/mssql_odbc.php b/phpBB/includes/db/mssql_odbc.php
index 7ead00cece..6e24f4e9e8 100644
--- a/phpBB/includes/db/mssql_odbc.php
+++ b/phpBB/includes/db/mssql_odbc.php
@@ -309,6 +309,14 @@ class dbal_mssql_odbc extends dbal
 		return str_replace(array("'", "\0"), array("''", ''), $msg);
 	}
 
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private
diff --git a/phpBB/includes/db/mssqlnative.php b/phpBB/includes/db/mssqlnative.php
index 8aac032135..8a4503f111 100644
--- a/phpBB/includes/db/mssqlnative.php
+++ b/phpBB/includes/db/mssqlnative.php
@@ -491,6 +491,14 @@ class dbal_mssqlnative extends dbal
 		return str_replace(array("'", "\0"), array("''", ''), $msg);
 	}
 
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private
diff --git a/phpBB/includes/functions_admin.php b/phpBB/includes/functions_admin.php
index 9798e514c1..5d19cd7adb 100644
--- a/phpBB/includes/functions_admin.php
+++ b/phpBB/includes/functions_admin.php
@@ -2556,7 +2556,8 @@ function view_log($mode, &$log, &$log_count, $limit = 0, $offset = 0, $forum_id
 		{
 			$sql_keywords .= $db->sql_in_set('l.log_operation', $operations) . ' OR ';
 		}
-		$sql_keywords .= 'LOWER(l.log_data) ' . implode(' OR LOWER(l.log_data) ', $keywords) . ')';
+		$sql_lower = $db->sql_lower_text('l.log_data');
+		$sql_keywords .= "$sql_lower " . implode(" OR $sql_lower ", $keywords) . ')';
 	}
 
 	if ($log_count !== false)