diff --git a/src/Mod/CAM/Path/Dressup/Gui/Dragknife.py b/src/Mod/CAM/Path/Dressup/Gui/Dragknife.py
index cada0a52f3..39db85c209 100644
--- a/src/Mod/CAM/Path/Dressup/Gui/Dragknife.py
+++ b/src/Mod/CAM/Path/Dressup/Gui/Dragknife.py
@@ -149,16 +149,17 @@ class ObjectDressup:
         return myAngle
 
     def getIncidentAngle(self, queue):
-        # '''returns in the incident angle in radians between the current and previous moves'''
+        # '''returns in the incident angle in degrees between the current and previous moves'''
 
         angleatend = float(math.degrees(self.segmentAngleXY(queue[2], queue[1], True)))
-        if angleatend < 0:
-            angleatend = 360 + angleatend
         angleatstart = float(math.degrees(self.segmentAngleXY(queue[1], queue[0])))
-        if angleatstart < 0:
-            angleatstart = 360 + angleatstart
 
-        incident_angle = angleatend - angleatstart
+        incident_angle = (angleatstart - angleatend + 360) % 360
+
+        # The incident can never be greater than 180 degrees.  If it is
+        # then we need to measure the other way around the circle.
+        if incident_angle > 180:
+            incident_angle = 360 - incident_angle
 
         return incident_angle