diff --git a/stepmania/src/Makefile.am b/stepmania/src/Makefile.am
index c87022e677..fb964b9395 100644
--- a/stepmania/src/Makefile.am
+++ b/stepmania/src/Makefile.am
@@ -103,7 +103,7 @@ GrooveRadar.h GroupList.cpp GroupList.h JukeboxMenu.cpp JukeboxMenu.h MenuElemen
 MenuTimer.cpp MenuTimer.h MusicBannerWheel.cpp MusicBannerWheel.h MusicList.cpp MusicList.h MusicSortDisplay.cpp \
 MusicSortDisplay.h MusicWheel.cpp MusicWheel.h MusicWheelItem.cpp MusicWheelItem.h OptionIcon.cpp OptionIcon.h \
 OptionIconRow.cpp OptionIconRow.h OptionsCursor.cpp OptionsCursor.h ScrollBar.cpp ScrollBar.h ScrollingList.cpp \
-ScrollingList.h SnapDisplay.cpp SnapDisplay.h TextBanner.cpp TextBanner.h \
+ScrollingList.h SnapDisplay.cpp SnapDisplay.h TextBanner.cpp TextBanner.h DifficultyDisplay.cpp DifficultyDisplay.h\
 HelpDisplay.cpp HelpDisplay.h WheelNotifyIcon.cpp WheelNotifyIcon.h GrooveGraph.cpp GrooveGraph.h EnemyFace.cpp \
 EnemyFace.h EnemyHealth.cpp EnemyHealth.h MeterDisplay.cpp MeterDisplay.h