diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index f4a58755c3..49e78f40dd 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -1997,6 +1997,7 @@ public:
     }
 
     wxMBConv_win32(const wxMBConv_win32& conv)
+        : wxMBConv()
     {
         m_CodePage = conv.m_CodePage;
         m_minMBCharWidth = conv.m_minMBCharWidth;