diff --git a/src/_impl/_angle_between_impl.scad b/src/_impl/_angle_between_impl.scad
index b2b5a2c6..b412aee7 100644
--- a/src/_impl/_angle_between_impl.scad
+++ b/src/_impl/_angle_between_impl.scad
@@ -3,10 +3,5 @@ function angle_between_ccw_2d(v1, v2) =
 	a >= 0 ? a : a + 360;
 
 function angle_between_ccw_3d(v1, v2) = 
-    let(
-	    dot = v1 * v2,
-		lenSq1 = v1.x ^ 2 + v1.y ^ 2 + v1.z ^ 2,
-		lenSq2 = v2.x ^ 2 + v2.y ^ 2 + v2.z ^ 2,
-	    a = acos(dot / sqrt(lenSq1 * lenSq2))
-	)
+    let(a = acos(v1 * v2 / sqrt((v1 * v1) * (v2 * v2))))
 	a >= 0 ? a : a + 360;
\ No newline at end of file