diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index f2126512..e5e3cb6c 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -475,7 +475,6 @@ namespace {
                      +  69 * kingAttacksCount[Them]
                      + 185 * popcount(kingRing[Us] & weak)
                      + 150 * popcount(pos.blockers_for_king(Us) | unsafeChecks)
-                     +   4 * tropism
                      - 873 * !pos.count<QUEEN>(Them)
                      -   6 * mg_value(score) / 8
                      +       mg_value(mobility[Them] - mobility[Us])