https://github.com/ImageMagick/ImageMagick/issues/1131

diff --git a/coders/heic.c b/coders/heic.c
index 493d99fd97fa484ff41159c33e4481c31948fa88..f9ed658d62406851aae8f7b7a51ae5e329dcea5c 100644 (file)
--- a/coders/heic.c
+++ b/coders/heic.c
@@ -375,6 +375,7 @@ ModuleExport size_t RegisterHEICImage(void)
   entry->mime_type=ConstantString("image/x-heic");
   entry->flags|=CoderDecoderSeekableStreamFlag;
   entry->flags^=CoderAdjoinFlag;
+  entry->flags^=CoderDecoderThreadSupportFlag;
   (void) RegisterMagickInfo(entry);
   return(MagickImageCoderSignature);
 }