diff --git a/src/Mod/Path/PathScripts/PathSurface.py b/src/Mod/Path/PathScripts/PathSurface.py
index 373f95bde9..5e05ee6252 100644
--- a/src/Mod/Path/PathScripts/PathSurface.py
+++ b/src/Mod/Path/PathScripts/PathSurface.py
@@ -2093,7 +2093,7 @@ class ObjectSurface(PathOp.ObjectOp):
             for nxt in line[2:]:
                 if not pnt.isOnLineSegment(prv, nxt):
                     pts.append(pnt)
-                prv = pnt
+                    prv = pnt
                 pnt = nxt
             pts.append(line[-1])
             return pts