diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 86c6bc2505..e4727b9705 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -752,7 +752,7 @@ function phpbb_is_writable($file)
 * @param string $path Path to check absoluteness of
 * @return boolean
 */
-function is_absolute($path)
+function phpbb_is_absolute($path)
 {
 	return ($path[0] == '/' || (DIRECTORY_SEPARATOR == '\\' && preg_match('#^[a-z]:[/\\\]#i', $path))) ? true : false;
 }
@@ -772,7 +772,7 @@ function phpbb_own_realpath($path)
 	$path_prefix = '';
 
 	// Determine what sort of path we have
-	if (is_absolute($path))
+	if (phpbb_is_absolute($path))
 	{
 		$absolute = true;
 
diff --git a/phpBB/includes/template/template.php b/phpBB/includes/template/template.php
index c16eddc426..010284edf3 100644
--- a/phpBB/includes/template/template.php
+++ b/phpBB/includes/template/template.php
@@ -526,7 +526,7 @@ class phpbb_template
 	*/
 	public function _php_include($filename)
 	{
-		if (is_absolute($filename))
+		if (phpbb_is_absolute($filename))
 		{
 			$file = $filename;
 		}
diff --git a/tests/template/includephp_test.php b/tests/template/includephp_test.php
index 64240e1be8..aac9cccc8a 100644
--- a/tests/template/includephp_test.php
+++ b/tests/template/includephp_test.php
@@ -26,7 +26,7 @@ class phpbb_template_includephp_test extends phpbb_template_template_test_case
 	public function test_includephp_absolute()
 	{
 		$path_to_php = dirname(__FILE__) . '/templates/_dummy_include.php.inc';
-		$this->assertTrue(is_absolute($path_to_php));
+		$this->assertTrue(phpbb_is_absolute($path_to_php));
 		$template_text = "Path is absolute.\n<!-- INCLUDEPHP $path_to_php -->";
 
 		$cache_dir = dirname($this->template->cachepath) . '/';