diff --git a/src/main_lbvh.cpp b/src/main_lbvh.cpp
index a92221ee..af1cd585 100644
--- a/src/main_lbvh.cpp
+++ b/src/main_lbvh.cpp
@@ -1036,21 +1036,18 @@ void findRegion(int *i_begin, int *i_end, int *bit_index, const std::vector<mort
         throw std::runtime_error("842384298293482");
     }
 
-    int found_bit = -1;
     int dir = 0;
-    for (int b = NBITS - 1; b >= 0; --b) {
-        int l = getBit(codes[i_node-1], b);
-        int m = getBit(codes[i_node], b);
-        int r = getBit(codes[i_node+1], b);
-        if (l == 0 && m == 0 && r == 1) {
+    int i_bit = NBITS-1;
+    for (; i_bit >= 0; --i_bit) {
+      int b2 = getBit(codes[i_node - 1], i_bit);
+        int b1 = getBit(codes[i_node], i_bit);
+        int b0 = getBit(codes[i_node + 1], i_bit);
+        int mask = (b2 << 2) | (b1 << 1) | (b0);
+        if (mask == 0b001) {
             dir = -1;
-            found_bit = b;
             break;
-        }
-
-        if (l == 0 && m == 1 && r == 1) {
+        } else if (mask == 0b011) {
             dir = 1;
-            found_bit = b;
             break;
         }
     }