diff --git a/src/search.h b/src/search.h
index 2342d9e93c4..b599da110a2 100644
--- a/src/search.h
+++ b/src/search.h
@@ -287,7 +287,6 @@ class Worker {
     PawnHistory           pawnHistory;
 
     PawnCorrectionHistory         pawnCorrectionHistory;
-    MaterialCorrectionHistory     materialCorrectionHistory;
     MajorPieceCorrectionHistory   majorPieceCorrectionHistory;
     MinorPieceCorrectionHistory   minorPieceCorrectionHistory;
     NonPawnCorrectionHistory      nonPawnCorrectionHistory[COLOR_NB];