diff --git a/core/fonts/OpenSans-Light.ttf b/core/fonts/OpenSans-Light.ttf
new file mode 100644
index 0000000000000..0d381897da203
Binary files /dev/null and b/core/fonts/OpenSans-Light.ttf differ
diff --git a/core/fonts/OpenSans-Semibold.ttf b/core/fonts/OpenSans-Semibold.ttf
new file mode 100644
index 0000000000000..1a7679e3949fb
Binary files /dev/null and b/core/fonts/OpenSans-Semibold.ttf differ
diff --git a/lib/private/Avatar.php b/lib/private/Avatar.php
index cd29017333cff..45ad66d0817e6 100644
--- a/lib/private/Avatar.php
+++ b/lib/private/Avatar.php
@@ -254,7 +254,7 @@ private function generateAvatar($userDisplayName, $size) {
 		$white = imagecolorallocate($im, 255, 255, 255);
 		imagefilledrectangle($im, 0, 0, $size, $size, $background);
 
-		$font = __DIR__ . '/../../core/fonts/OpenSans-Semibold.woff';
+		$font = __DIR__ . '/../../core/fonts/OpenSans-Semibold.ttf';
 
 		$fontSize = $size * 0.4;
 		$box = imagettfbbox($fontSize, 0, $font, $text);