diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index a52cdf09..b20c93b7 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -622,7 +622,7 @@ namespace {
 
         if (r > RANK_3)
         {
-            int w = (r-2) * (r-2) + 2;
+            int w = 5 * r - 13;
             Square blockSq = s + Up;
 
             // Adjust bonus based on the king's proximity