diff --git a/src/Makefile b/src/Makefile
index d0368635c..fad0b6cd4 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -51,7 +51,7 @@ CPPFLAGS += -MD -MP
 sources = Network.cpp Training.cpp UCTSearch.cpp Utils.cpp Random.cpp Parameters.cpp \
 		UCTNode.cpp OpenCL.cpp Timing.cpp main.cpp Tuner.cpp \
 		Bitboard.cpp Movegen.cpp Position.cpp UCI.cpp pgn.cpp SMP.cpp OpenCLScheduler.cpp \
-		NNCache.cpp TimeMan.cpp
+		NNCache.cpp TimeMan.cpp UCIOption.cpp
 
 objects = $(sources:.cpp=.o)
 deps = $(sources:%.cpp=%.d)
diff --git a/src/UCI.h b/src/UCI.h
index 1192de61e..cc269f14b 100644
--- a/src/UCI.h
+++ b/src/UCI.h
@@ -27,7 +27,7 @@
 #include "Types.h"
 
 class Position;
-class BoardHistory;
+struct BoardHistory;
 
 namespace UCI {