diff --git a/game/Makefile.am b/game/Makefile.am
index 02ceed7..5a23062 100644
--- a/game/Makefile.am
+++ b/game/Makefile.am
@@ -20,25 +20,26 @@ noinst_LIBRARIES = libgame.a
 
 INCLUDES = -I$(top_srcdir)/dic
 
-libgame_a_SOURCES = 		\
-	ai_percent.cpp ai_percent.h	\
-	ai_player.h				\
-	tile.cpp tile.h			\
-	bag.cpp bag.h			\
-	coord.cpp coord.h		\
-	cross.cpp cross.h		\
-	board.cpp board.h		\
-	board_cross.cpp			\
-	board_search.cpp		\
-	duplicate.cpp duplicate.h	\
-	freegame.cpp freegame.h	\
-	game.cpp game.h			\
-	game_factory.cpp game_factory.h	\
-	player.cpp player.h		\
-	pldrack.cpp pldrack.h	\
-	rack.cpp rack.h			\
-	results.cpp results.h	\
-	round.cpp round.h		\
-	training.cpp training.h	\
-	turn.cpp turn.h
+libgame_a_SOURCES=           \
+	ai_percent.cpp ai_percent.h     \
+	ai_player.h                     \
+	tile.cpp tile.h                 \
+	bag.cpp bag.h                   \
+	coord.cpp coord.h               \
+	cross.cpp cross.h               \
+	board.cpp board.h               \
+	board_cross.cpp                 \
+	board_search.cpp                \
+	duplicate.cpp duplicate.h       \
+	freegame.cpp freegame.h         \
+	game.cpp game.h                 \
+	game_factory.cpp game_factory.h \
+	player.cpp player.h             \
+	pldrack.cpp pldrack.h           \
+	rack.cpp rack.h                 \
+	results.cpp results.h           \
+	round.cpp round.h               \
+	training.cpp training.h         \
+	turn.cpp turn.h                 \
+	history.cpp history.h