diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 6b590c78..607694e0 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -600,8 +600,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
             // Penalize rooks which are trapped inside a king. Penalize more if
             // king has lost right to castle.
             if (   ((file_of(ksq) < FILE_E) == (file_of(s) < file_of(ksq)))
-                && rank_of(ksq) == rank_of(s)
-                && relative_rank(Us, ksq) == RANK_1
+                && (rank_of(ksq) == rank_of(s) || relative_rank(Us, ksq) == RANK_1)
                 && !ei.pi->half_open_on_side(Us, file_of(ksq), file_of(ksq) < FILE_E))
                 score -= (TrappedRookPenalty - make_score(mob * 8, 0)) * (pos.can_castle(Us) ? 1 : 2);
         }