diff --git a/include/wx/cmndata.h b/include/wx/cmndata.h
index 1ec6859ecb..31269412d8 100644
--- a/include/wx/cmndata.h
+++ b/include/wx/cmndata.h
@@ -228,7 +228,7 @@ public:
     wxString GetFilename() const { return m_filename; }
     void SetFilename( const wxString &filename ) { m_filename = filename; }
 
-    void operator=(const wxPrintData& data);
+    wxPrintData& operator=(const wxPrintData& data);
 
     char* GetPrivData() const { return m_privData; }
     int GetPrivDataLen() const { return m_privDataLen; }
diff --git a/src/common/cmndata.cpp b/src/common/cmndata.cpp
index 8c1309a9df..4a02c49298 100644
--- a/src/common/cmndata.cpp
+++ b/src/common/cmndata.cpp
@@ -256,8 +256,11 @@ void wxPrintData::ConvertFromNative()
     m_nativeData->TransferTo( *this ) ;
 }
 
-void wxPrintData::operator=(const wxPrintData& data)
+wxPrintData& wxPrintData::operator=(const wxPrintData& data)
 {
+    if ( &data == this )
+        return *this;
+
     m_printNoCopies = data.m_printNoCopies;
     m_printCollate = data.m_printCollate;
     m_printOrientation = data.m_printOrientation;
@@ -295,6 +298,8 @@ void wxPrintData::operator=(const wxPrintData& data)
         m_privData = new char[m_privDataLen];
         memcpy( m_privData, data.GetPrivData(), m_privDataLen );
     }
+
+    return *this;
 }
 
 // Is this data OK for showing the print dialog?