diff --git a/stepmania/src/Makefile.am b/stepmania/src/Makefile.am
index c43d9df78a..b771308b9e 100644
--- a/stepmania/src/Makefile.am
+++ b/stepmania/src/Makefile.am
@@ -87,6 +87,7 @@ endif
 
 if HAVE_ALSA
 Sound += arch/Sound/RageSoundDriver_ALSA9.cpp arch/Sound/RageSoundDriver_ALSA9.h \
+	 arch/Sound/RageSoundDriver_ALSA9_Software.cpp arch/Sound/RageSoundDriver_ALSA9_Software.h \
 	 arch/Sound/ALSA9Helpers.cpp arch/Sound/ALSA9Helpers.h
 endif