1 files changed, 2 insertions, 1 deletions
diff --git a/cpp/src/qpid/framing/ModelMethod.h b/cpp/src/qpid/framing/ModelMethod.h
index 8e2fafb019..f3c0fa5d65 100644
--- a/cpp/src/qpid/framing/ModelMethod.h
+++ b/cpp/src/qpid/framing/ModelMethod.h
@@ -30,13 +30,14 @@ namespace framing {
 
 class ModelMethod : public AMQMethodBody 
 {
-    ExecutionHeader header;
+    mutable ExecutionHeader header;
 public:    
     virtual ~ModelMethod() {}
     virtual void encode(Buffer& buffer) const { header.encode(buffer); }
     virtual void decode(Buffer& buffer, uint32_t size=0) { header.decode(buffer, size); }
     virtual uint32_t size() const { return header.size(); } 
     virtual bool isSync() const { return header.getSync(); }
+    virtual void setSync(bool on) const { header.setSync(on); }
     ExecutionHeader& getHeader() { return header; } 
     const ExecutionHeader& getHeader()  const { return header; } 
 };