diff --git a/src/scene/scene_mesh.js b/src/scene/scene_mesh.js
index 9c551374ddf..48899aa6adb 100644
--- a/src/scene/scene_mesh.js
+++ b/src/scene/scene_mesh.js
@@ -163,9 +163,11 @@ pc.extend(pc, function () {
                     var offsetWF = offsetW / 4;
                     var vertSizeF = vertSize / 4;
 
+                    var bMax, bMin;
                     var x, y, z;
                     var boneMin = [];
                     var boneMax = [];
+
                     for(i=0; i<numBones; i++) {
                         boneMin[i] = new pc.Vec3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
                         boneMax[i] = new pc.Vec3(-Number.MAX_VALUE, -Number.MAX_VALUE, -Number.MAX_VALUE);
@@ -180,13 +182,16 @@ pc.extend(pc, function () {
                                 y = dataF[j * vertSizeF + offsetPF + 1];
                                 z = dataF[j * vertSizeF + offsetPF + 2];
 
-                                boneMin[index].x = Math.min(boneMin[index].x, x);
-                                boneMin[index].y = Math.min(boneMin[index].y, y);
-                                boneMin[index].z = Math.min(boneMin[index].z, z);
+                                bMax = boneMax[index];
+                                bMin = boneMin[index];
+
+                                if (bMin.x > x) bMin.x = x;
+                                if (bMin.y > y) bMin.y = y;
+                                if (bMin.z > z) bMin.z = z;
 
-                                boneMax[index].x = Math.max(boneMax[index].x, x);
-                                boneMax[index].y = Math.max(boneMax[index].y, y);
-                                boneMax[index].z = Math.max(boneMax[index].z, z);
+                                if (bMax.x < x) bMax.x = x;
+                                if (bMax.y < y) bMax.y = y;
+                                if (bMax.z < z) bMax.z = z;
                             }
                         }
                     }