diff --git a/src/common/fs_zip.cpp b/src/common/fs_zip.cpp
index d322d77547..8c928d263a 100644
--- a/src/common/fs_zip.cpp
+++ b/src/common/fs_zip.cpp
@@ -151,7 +151,7 @@ wxString wxZipFSHandler::FindFirst(const wxString& spec, int flags)
 
     m_ZipFile = left;
     wxString nativename = wxFileSystem::URLToFileName(m_ZipFile).GetFullPath();
-    m_Archive = (void*) unzOpen(nativename.fn_str());
+    m_Archive = (void*) unzOpen(nativename.mb_str(wxConvFile));
     m_Pattern = right.AfterLast(wxT('/'));
     m_BaseDir = right.BeforeLast(wxT('/'));
 
diff --git a/src/common/zipstrm.cpp b/src/common/zipstrm.cpp
index 9401ef1c1a..d01d464df2 100644
--- a/src/common/zipstrm.cpp
+++ b/src/common/zipstrm.cpp
@@ -40,7 +40,7 @@ wxZipInputStream::wxZipInputStream(const wxString& archive, const wxString& file
 
     m_Pos = 0;
     m_Size = 0;
-    m_Archive = (void*) unzOpen(archive.fn_str());
+    m_Archive = (void*) unzOpen(archive.mb_str(wxConvFile));
     if (m_Archive == NULL)
     {
         m_lasterror = wxSTREAM_READ_ERROR;