diff --git a/Libs/cadquery/cadquery/freecad_impl/shapes.py b/Libs/cadquery/cadquery/freecad_impl/shapes.py
index 16fa39f..62cb2da 100644
--- a/Libs/cadquery/cadquery/freecad_impl/shapes.py
+++ b/Libs/cadquery/cadquery/freecad_impl/shapes.py
@@ -830,6 +830,8 @@ class Solid(Shape):
         #make faces for the top and bottom
         startFace = FreeCADPart.Face(startWires)
         endFace = FreeCADPart.Face(endWires)
+        startFace.validate()
+        endFace.validate()
 
         #collect all the faces from the sides
         faceList = [startFace]
@@ -876,6 +878,7 @@ class Solid(Shape):
             freeCADWires.append(w.wrapped)
 
         f = FreeCADPart.Face(freeCADWires)
+        f.validate()
         result = f.extrude(vecNormal.wrapped)
 
         return Shape.cast(result)
@@ -912,6 +915,7 @@ class Solid(Shape):
             freeCADWires.append(w.wrapped)
 
         f = FreeCADPart.Face(freeCADWires)
+        f.validate()
 
         rotateCenter = FreeCAD.Base.Vector(axisStart)
         rotateAxis = FreeCAD.Base.Vector(axisEnd)