diff --git a/src/QoiSharp/QoiEncoder.cs b/src/QoiSharp/QoiEncoder.cs
index 05ef113..adf98e0 100644
--- a/src/QoiSharp/QoiEncoder.cs
+++ b/src/QoiSharp/QoiEncoder.cs
@@ -32,7 +32,7 @@ public static byte[] Encode(QoiImage image)
         byte colorSpace = (byte)image.ColorSpace;
         byte[] pixels = image.Data;
 
-        byte[] bytes = new byte[QoiCodec.HeaderSize + QoiCodec.Padding.Length + (width * height * channels)];
+        byte[] bytes = new byte[QoiCodec.HeaderSize + QoiCodec.Padding.Length + (width * height * (channels + 1))];
 
         bytes[0] = (byte)(QoiCodec.Magic >> 24);
         bytes[1] = (byte)(QoiCodec.Magic >> 16);