diff --git a/source/tools/atlas/AtlasUI/ArchiveViewer/ArchiveViewer.cpp b/source/tools/atlas/AtlasUI/ArchiveViewer/ArchiveViewer.cpp
index 2330ce8a87..81aa4d5c1f 100644
--- a/source/tools/atlas/AtlasUI/ArchiveViewer/ArchiveViewer.cpp
+++ b/source/tools/atlas/AtlasUI/ArchiveViewer/ArchiveViewer.cpp
@@ -461,7 +461,7 @@ void ArchiveViewer::ExtractFiles(bool onlySelected)
 			wxString filename = wxString( utf16tow(file.filename).c_str() );
 			int lastSlash = filename.Find(_T('\\'), true);
 			if (lastSlash != -1)
-				dirs.insert(filename.Mid(0, lastSlash+1).c_str());
+				dirs.insert(filename.Mid(0, lastSlash+1).wc_str());
 		}
 
 		// Construct the directory tree: