diff --git a/src/ImageSharp/Formats/Gif/GifDecoderCore.cs b/src/ImageSharp/Formats/Gif/GifDecoderCore.cs
index bb230beac..948103fed 100644
--- a/src/ImageSharp/Formats/Gif/GifDecoderCore.cs
+++ b/src/ImageSharp/Formats/Gif/GifDecoderCore.cs
@@ -157,6 +157,10 @@ namespace ImageSharp.Formats
                     }
 
                     nextFlag = stream.ReadByte();
+                    if (nextFlag == -1)
+                    {
+                        break;
+                    }
                 }
             }
             finally