diff --git a/src/Mod/Draft/WorkingPlane.py b/src/Mod/Draft/WorkingPlane.py
index cc6b69473..440d1fc6e 100644
--- a/src/Mod/Draft/WorkingPlane.py
+++ b/src/Mod/Draft/WorkingPlane.py
@@ -236,6 +236,8 @@ class plane:
                 if DraftVecUtils.equals(self.u,Vector(0,0,1)):
                     # the X axis is vertical: rotate 90 degrees
                     self.u,self.v = self.v.negative(),self.u
+                elif DraftVecUtils.equals(self.u,Vector(0,0,-1)):
+                    self.u,self.v = self.v,self.u.negative()
                     
             self.weak = False
             return True