diff --git a/benchmark/bm_ao_render.rb b/benchmark/bm_ao_render.rb
index af9169747..e1d2565a8 100644
--- a/benchmark/bm_ao_render.rb
+++ b/benchmark/bm_ao_render.rb
@@ -179,7 +179,7 @@ def clamp(f)
   i.to_i
 end
 
-def otherBasis(basis, n)
+def orthoBasis(basis, n)
   basis[2] = Vec.new(n.x, n.y, n.z)
   basis[1] = Vec.new(0.0, 0.0, 0.0)
 
@@ -211,7 +211,7 @@ class Scene
 
   def ambient_occlusion(isect)
     basis = Array.new(3)
-    otherBasis(basis, isect.n)
+    orthoBasis(basis, isect.n)
 
     ntheta    = NAO_SAMPLES
     nphi      = NAO_SAMPLES