diff --git a/test/phpunit/FunctionsLibTest.php b/test/phpunit/FunctionsLibTest.php
index 287f759982c..c8843d36209 100644
--- a/test/phpunit/FunctionsLibTest.php
+++ b/test/phpunit/FunctionsLibTest.php
@@ -1117,12 +1117,12 @@ class FunctionsLibTest extends PHPUnit\Framework\TestCase
 	{
 		$s=img_picto('title', 'user');
 		print __METHOD__." s=".$s."\n";
-		$this->assertContains('fa-user', $s, 'testImgPicto1');
+		$this->assertStringContainsStringIgnoringCase('fa-user', $s, 'testImgPicto1');
 
 		$s=img_picto('title', 'img.png', 'style="float: right"', 0);
 		print __METHOD__." s=".$s."\n";
-		$this->assertContains('theme', $s, 'testImgPicto2');
-		$this->assertContains('style="float: right"', $s, 'testImgPicto2');
+		$this->assertStringContainsStringIgnoringCase('theme', $s, 'testImgPicto2');
+		$this->assertStringContainsStringIgnoringCase('style="float: right"', $s, 'testImgPicto2');
 
 		$s=img_picto('title', '/fullpath/img.png', '', 1);
 		print __METHOD__." s=".$s."\n";