diff --git a/src/Makefile b/src/Makefile
index 2a8565ff..27969174 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -46,6 +46,7 @@ OBJS = benchmark.o bitbase.o bitboard.o endgame.o evaluate.o main.o \
 	eval/nnue/features/half_relative_kp.o \
 	eval/nnue/features/k.o \
 	eval/nnue/features/p.o \
+	eval/nnue/features/castling_right.o \
 	eval/nnue/nnue_test_command.o \
 	extra/sfen_packer.o \
 	learn/gensfen2019.o \