From f630224cc864a2b4020abd0a25d6fa704766c36c Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Sun, 24 Dec 2017 20:04:57 -0500
Subject: [PATCH] ...

---
 MagickCore/blob.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 793c9d281..90dbfd00e 100644
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -3292,6 +3292,8 @@ MagickExport MagickBooleanType OpenBlob(const ImageInfo *image_info,
           {
             if (mode == WriteBinaryBlobMode)
               type="wb";
+            if (mode == AppendBinaryBlobMode)
+              type="ab";
             blob_info->file_info.gzfile=gzopen(filename,type);
             if (blob_info->file_info.gzfile != (gzFile) NULL)
               blob_info->type=ZipStream;
-- 
2.40.0