diff --git a/libraries/lib-string-utils/CodeConversions.cpp b/libraries/lib-string-utils/CodeConversions.cpp
index 54fc4d748..fc989b950 100644
--- a/libraries/lib-string-utils/CodeConversions.cpp
+++ b/libraries/lib-string-utils/CodeConversions.cpp
@@ -28,7 +28,14 @@ std::string ToUTF8 (const wchar_t* wstr)
 
 std::string ToUTF8 (const wxString& wstr)
 {
+#if wxCHECK_VERSION(3, 1, 1)
     return wstr.ToStdString (wxGet_wxConvUTF8 ());
+#elif !wxUSE_UNICODE
+    return std::string (wstr.c_str (), wstr.length ());
+#else
+    wxScopedCharBuffer buf (wstr.mb_str (wxGet_wxConvUTF8 ()));
+    return std::string (buf.data (), buf.length ());
+#endif
 }
 
 std::wstring ToWString (const std::string& str)
@@ -48,7 +55,11 @@ std::wstring ToWString (const wxString& str)
 
 wxString ToWXString (const std::string& str)
 {
+#if wxCHECK_VERSION(3, 1, 1)
     return wxString::FromUTF8 (str);
+#else
+    return wxString::FromUTF8 (str.c_str());
+#endif
 }
 
 wxString ToWXString (const std::wstring& str)