diff --git a/src/Mod/Arch/ArchStructure.py b/src/Mod/Arch/ArchStructure.py
index a7f49bb2f9..41fd8e2301 100644
--- a/src/Mod/Arch/ArchStructure.py
+++ b/src/Mod/Arch/ArchStructure.py
@@ -484,7 +484,7 @@ class _Structure(ArchComponent.Component):
                         if not baseface:
                             for w in obj.Base.Shape.Wires:
                                 w.fix(0.1,0,1) # fixes self-intersecting wires
-                                f = Part.Face(sh)
+                                f = Part.Face(w)
                                 if baseface:
                                     baseface = baseface.fuse(f)
                                 else: