From 15411c93fa91c0d0c25d98b08a3d5cc9de720fc7 Mon Sep 17 00:00:00 2001
From: endroid <info@endroid.nl>
Date: Mon, 7 May 2018 16:04:16 +0000
Subject: [PATCH] Use of constant gives errors

---
 src/Writer/PngWriter.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Writer/PngWriter.php b/src/Writer/PngWriter.php
index 4c1da18..61253cb 100644
--- a/src/Writer/PngWriter.php
+++ b/src/Writer/PngWriter.php
@@ -159,7 +159,7 @@ private function imageToString($image): string
 
     public static function getContentType(): string
     {
-        return IMAGETYPE_PNG;
+        return 'image/png';
     }
 
     public static function getSupportedExtensions(): array