diff --git a/gui/wxpython/gui_core/dialogs.py b/gui/wxpython/gui_core/dialogs.py
index b625d340a7a..7b682c0d084 100644
--- a/gui/wxpython/gui_core/dialogs.py
+++ b/gui/wxpython/gui_core/dialogs.py
@@ -986,8 +986,7 @@ def OnGSelAll(self, event):
         if not check:
             self.gLayerBox.DeselectAll()
         else:
-            for item in range(self.subgListBox.GetCount()):
-                self.gLayerBox.Select(item)
+            self.gLayerBox.SelectAll()
 
         event.Skip()
 
diff --git a/gui/wxpython/gui_core/wrap.py b/gui/wxpython/gui_core/wrap.py
index 674b87fac48..325be0cf2bf 100644
--- a/gui/wxpython/gui_core/wrap.py
+++ b/gui/wxpython/gui_core/wrap.py
@@ -913,6 +913,10 @@ def DeselectAll(self):
         for i in range(self.GetCount()):
             self.Deselect(i)
 
+    def SelectAll(self):
+        for i in range(self.GetCount()):
+            self.Select(i)
+
 
 class HyperlinkCtrl(HyperlinkCtrl_):
     """Wrapper around HyperlinkCtrl to have more control