diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 7c7ce95c..fad0771d 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -145,7 +145,7 @@ namespace {
   constexpr Score ThreatByKing       = S( 24, 89);
   constexpr Score ThreatByPawnPush   = S( 48, 39);
   constexpr Score ThreatBySafePawn   = S(173, 94);
-  constexpr Score TrappedRook        = S( 52, 10);
+  constexpr Score TrappedRook        = S( 52, 30);
   constexpr Score WeakQueen          = S( 49, 15);
 
 #undef S