diff --git a/actions/peoplesearch.php b/actions/peoplesearch.php
index a4e9308cf6..cf79e52e98 100644
--- a/actions/peoplesearch.php
+++ b/actions/peoplesearch.php
@@ -132,7 +132,7 @@ class PeoplesearchAction extends Action {
 	}
 
 	function highlight($text, $terms) {
-		$pattern = '/('.implode('|',array_map('htmlspecialchars', $terms)).')/';
+		$pattern = '/('.implode('|',array_map('htmlspecialchars', $terms)).')/i';
 		$result = preg_replace($pattern, '<strong>\\1</strong>', $text);
 		return $result;
 	}