diff --git a/src/add-ons/translators/shared/StreamBuffer.cpp b/src/add-ons/translators/shared/StreamBuffer.cpp
index 63f28893c2..3551c1326a 100644
--- a/src/add-ons/translators/shared/StreamBuffer.cpp
+++ b/src/add-ons/translators/shared/StreamBuffer.cpp
@@ -242,7 +242,7 @@ StreamBuffer::Position()
 {
 	off_t position = fStream->Position();
 	if (fToRead)
-		position -= fPos;
+		position -= (fLen - fPos);
 	else
 		position += fLen;
 	return position;