diff --git a/src/Lzw/LzwInputStream.cs b/src/Lzw/LzwInputStream.cs
index 94b8b66e2..1ff80eb05 100644
--- a/src/Lzw/LzwInputStream.cs
+++ b/src/Lzw/LzwInputStream.cs
@@ -129,7 +129,8 @@ public override int ReadByte() {
         public override int Read(byte[] buffer, int offset, int count) {
             if (!headerParsed) ParseHeader();
 
-            if (eof) return -1;
+            if (eof) return 0;
+
             int start = offset;
 
             /* Using local copies of various variables speeds things up by as