diff --git a/src/Mod/PartDesign/PartDesignTests/TestInvoluteGear.py b/src/Mod/PartDesign/PartDesignTests/TestInvoluteGear.py
index 2dfdbb6d71..a732c5e449 100644
--- a/src/Mod/PartDesign/PartDesignTests/TestInvoluteGear.py
+++ b/src/Mod/PartDesign/PartDesignTests/TestInvoluteGear.py
@@ -125,7 +125,7 @@ class TestInvoluteGear(unittest.TestCase):
         root_diameter = pitch_diameter + 2 * ded_coef * m
         # the test purpose here is just to ensure the gear's parameters are used,
         # not super precise profile verification. Thus a lax delta is just file here.
-        delta = 0.1 # FIXME it seems that the top land arc is in the wrong direction, thus a larger tolerance.
+        delta = 0.01
         self.assertIntersection(hub.Shape, makeCircle(pitch_diameter/2), "Expecting intersection at pitch circle")
         self.assertNoIntersection(hub.Shape, makeCircle(tip_diameter/2 - delta), "Teeth extent below tip circle")
         self.assertNoIntersection(hub.Shape, makeCircle(root_diameter/2 + delta), "Teeth extend beyond root circle")
diff --git a/src/Mod/PartDesign/fcgear/involute.py b/src/Mod/PartDesign/fcgear/involute.py
index d749f4b930..4bbafde3d5 100644
--- a/src/Mod/PartDesign/fcgear/involute.py
+++ b/src/Mod/PartDesign/fcgear/involute.py
@@ -312,11 +312,7 @@ def CreateInternalGear(w, m, Z, phi,
         if (not tipWithinInvolute):
             w.line(tip) # line from tip down to base circle
 
-        if split:
-            w.arc(tipR, Ra, 0) # arc across addendum circle
-        else:
-            #w.arc(tipR[-1], Ra, 0) # arc across addendum circle
-            w.arc(tipR, Ra, 0)
+        w.arc(tipR, Ra, 1) # arc across addendum circle
 
         if (not tipWithinInvolute):
             w.line(invR[0]) # line up to the base circle
@@ -329,7 +325,7 @@ def CreateInternalGear(w, m, Z, phi,
 
         if (rootNext[1] > rootR[1]):    # is there a section of root circle between fillets?
             w.arc(rootR, fRad, 1) # back fillet
-            w.arc(rootNext, Rroot, 0) # root circle arc
+            w.arc(rootNext, Rroot, 1) # root circle arc
 
         w.arc(filletNext, fRad, 1)