diff --git a/src/bin/package/PackageWriter.cpp b/src/bin/package/PackageWriter.cpp
index 27e2148b32..e56ea8ac7a 100644
--- a/src/bin/package/PackageWriter.cpp
+++ b/src/bin/package/PackageWriter.cpp
@@ -1296,6 +1296,6 @@ PackageWriter::_WriteZlibCompressedData(DataReader& dataReader, off_t size,
 		}
 	}
 
-	_compressedSize = writeOffset - dataOffset;
+	_compressedSize = writeOffset - offsetTableOffset;
 	return B_OK;
 }