diff --git a/stepmania/src/Makefile.am b/stepmania/src/Makefile.am
index 0fdaa5ba84..9a9b35807b 100644
--- a/stepmania/src/Makefile.am
+++ b/stepmania/src/Makefile.am
@@ -165,7 +165,8 @@ LyricDisplay.cpp LyricDisplay.h NoteDisplay.cpp NoteDisplay.h NoteField.cpp Note
 NoteFieldPlus.h NoteFieldPlus.cpp Player.cpp Player.h ProTimingDisplay.cpp ProTimingDisplay.h \
 ScoreDisplay.cpp ScoreDisplay.h ScoreDisplayBattle.cpp ScoreDisplayBattle.h ScoreDisplayNormal.cpp ScoreDisplayNormal.h \
 ScoreDisplayOni.cpp ScoreDisplayOni.h ScoreDisplayRave.cpp ScoreDisplayRave.h TimingAssist.cpp TimingAssist.h \
-PercentageDisplay.cpp PercentageDisplay.h ScoreDisplayPercentage.cpp ScoreDisplayPercentage.h
+PercentageDisplay.cpp PercentageDisplay.h ScoreDisplayPercentage.cpp ScoreDisplayPercentage.h \
+AttackDisplay.cpp AttackDisplay.h
 
 Helpers = SDL_dither.cpp SDL_dither.h SDL_rotozoom.cpp SDL_rotozoom.h SDL_utils.cpp SDL_utils.h