diff --git a/SheetMetalJunction.py b/SheetMetalJunction.py
index 0c5ea80..3d42a10 100644
--- a/SheetMetalJunction.py
+++ b/SheetMetalJunction.py
@@ -181,7 +181,7 @@ def IsActive(self):
                 return False
     #    selobj = Gui.Selection.getSelection()[0]
             for selEdge in sel.SubObjects:
-                if isinstance(selEdge, Part.Edge):
+                if not isinstance(selEdge, Part.Edge):
                     return False
             return True