diff -Nur id3lib-3.8.3-orig/src/io_helpers.cpp id3lib-3.8.3/src/io_helpers.cpp
--- id3lib-3.8.3-orig/src/io_helpers.cpp	2003-03-02 01:23:00.000000000 +0100
+++ id3lib-3.8.3/src/io_helpers.cpp	2005-07-16 12:47:11.000000000 +0200
@@ -363,9 +363,10 @@
     // Write the BOM: 0xFEFF
     unicode_t BOM = 0xFEFF;
     writer.writeChars((const unsigned char*) &BOM, 2);
+    const unsigned char* pdata = (const unsigned char*)data.c_str();
     for (size_t i = 0; i < size; i += 2)
     {
-      unicode_t ch = (data[i] << 8) | data[i+1];
+      unicode_t ch = (pdata[i] << 8) | pdata[i+1];
       writer.writeChars((const unsigned char*) &ch, 2);
     }
   }