diff --git a/tiff/lzw/reader.go b/tiff/lzw/reader.go
index 51ae39f..78204ba 100644
--- a/tiff/lzw/reader.go
+++ b/tiff/lzw/reader.go
@@ -178,7 +178,7 @@
 			break loop
 		case code <= d.hi:
 			c, i := code, len(d.output)-1
-			if code == d.hi {
+			if code == d.hi && d.last != decoderInvalidCode {
 				// code == hi is a special case which expands to the last expansion
 				// followed by the head of the last expansion. To find the head, we walk
 				// the prefix chain until we find a literal code.