diff --git a/stepmania/src/Makefile.am b/stepmania/src/Makefile.am
index 1ba7ed485d..15c2f9d4bb 100644
--- a/stepmania/src/Makefile.am
+++ b/stepmania/src/Makefile.am
@@ -228,7 +228,7 @@ RageBitmapTexture.cpp RageBitmapTexture.h RageDisplay.cpp RageDisplay.h RageDisp
 RageDisplay_Null.cpp RageDisplay_Null.h RageException.cpp RageException.h RageInput.cpp RageInput.h \
 RageInputDevice.cpp RageInputDevice.h RageLog.cpp RageLog.h RageMath.cpp RageMath.h \
 RageModelGeometry.cpp RageModelGeometry.h RageSound.cpp RageSound.h RageSoundManager.cpp RageSoundManager.h \
-RageSoundMixBuffer.cpp RageSoundMixBuffer.h \
+RageSoundUtil.cpp RageSoundUtil.h RageSoundMixBuffer.cpp RageSoundMixBuffer.h \
 RageSoundPosMap.cpp RageSoundPosMap.h RageSoundReader.h RageSoundReader_FileReader.cpp RageSoundReader_FileReader.h \
 RageSoundReader_Preload.cpp RageSoundReader_Preload.h RageSoundReader_Resample.cpp RageSoundReader_Resample.h \
 RageSoundReader_Resample_Fast.cpp RageSoundReader_Resample_Fast.h \