diff --git a/addons/filetree/katefiletreeproxymodel.cpp b/addons/filetree/katefiletreeproxymodel.cpp
--- a/addons/filetree/katefiletreeproxymodel.cpp
+++ b/addons/filetree/katefiletreeproxymodel.cpp
@@ -49,6 +49,7 @@
 
     QCollator collate;
     collate.setCaseSensitivity(Qt::CaseInsensitive);
+    collate.setNumericMode(true);
 
     switch (sortRole()) {
     case Qt::DisplayRole: {