diff --git a/taglib/mpeg/id3v2/id3v2frame.h b/taglib/mpeg/id3v2/id3v2frame.h
index 83e512bc..e76d0608 100644
--- a/taglib/mpeg/id3v2/id3v2frame.h
+++ b/taglib/mpeg/id3v2/id3v2frame.h
@@ -381,7 +381,7 @@ namespace TagLib {
 #endif
 
       /*!
-       * Returns true if unsyncronisation is enabled for this frame.
+       * Returns true if unsynchronisation is enabled for this frame.
        */
       bool unsynchronisation() const;
 
diff --git a/taglib/mpeg/id3v2/id3v2header.cpp b/taglib/mpeg/id3v2/id3v2header.cpp
index b08d5f4b..e14adcce 100644
--- a/taglib/mpeg/id3v2/id3v2header.cpp
+++ b/taglib/mpeg/id3v2/id3v2header.cpp
@@ -167,11 +167,12 @@ ByteVector Header::render() const
   v.append(char(4));
   v.append(char(0));
 
-  // Currently we don't actually support writing extended headers or footers, so
-  // make sure that the flags are set accordingly.
+  // Currently we don't actually support writing extended headers, footers or
+  // unsynchronized tags, make sure that the flags are set accordingly.
 
   d->extendedHeader = false;
   d->footerPresent = false;
+  d->unsynchronisation = false;
 
   // render and add the flags
   std::bitset<8> flags;