diff --git a/light/light.cc b/light/light.cc
index 015a509a..8368952d 100644
--- a/light/light.cc
+++ b/light/light.cc
@@ -538,11 +538,10 @@ CalcualateVertexNormals(const bsp2_t *bsp)
                 Face_Normal(bsp, f2, f2_norm);
 
                 const vec_t cosangle = DotProduct(f_norm, f2_norm);
-                const vec_t angle = acos(qmax(qmin(1.0f, cosangle), 0.0f));
-                const vec_t max_angle = DEG2RAD(qmin(f_smoothangle, f2_smoothangle));
+                const vec_t cosmaxangle = cos(DEG2RAD(qmin(f_smoothangle, f2_smoothangle)));
                 
                 // check the angle between the face normals
-                if (angle < max_angle) {
+                if (cosangle >= cosmaxangle) {
                     smoothFaces[f].insert(f2);
                 }
             }