diff --git a/contrib/utils/wxrc/wxrc.cpp b/contrib/utils/wxrc/wxrc.cpp
index f62a235ff3..3cd90a1d95 100644
--- a/contrib/utils/wxrc/wxrc.cpp
+++ b/contrib/utils/wxrc/wxrc.cpp
@@ -288,7 +288,8 @@ void XmlResApp::FindFilesInXML(wxXmlNode *node, wxArrayString& flist, const wxSt
             wxString filename = GetInternalFileName(n->GetContent(), flist);
             n->SetContent(filename);
 
-            flist.Add(filename);
+            if (flist.Index(filename) == wxNOT_FOUND)
+                flist.Add(filename);
 
             wxFileInputStream sin(fullname);
             wxFileOutputStream sout(parOutputPath + "/" + filename);
diff --git a/utils/wxrc/wxrc.cpp b/utils/wxrc/wxrc.cpp
index f62a235ff3..3cd90a1d95 100644
--- a/utils/wxrc/wxrc.cpp
+++ b/utils/wxrc/wxrc.cpp
@@ -288,7 +288,8 @@ void XmlResApp::FindFilesInXML(wxXmlNode *node, wxArrayString& flist, const wxSt
             wxString filename = GetInternalFileName(n->GetContent(), flist);
             n->SetContent(filename);
 
-            flist.Add(filename);
+            if (flist.Index(filename) == wxNOT_FOUND)
+                flist.Add(filename);
 
             wxFileInputStream sin(fullname);
             wxFileOutputStream sout(parOutputPath + "/" + filename);