diff --git a/stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp b/stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp
index c01f5430fa..a043200246 100644
--- a/stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp
+++ b/stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp
@@ -6,6 +6,7 @@
 #include "RageLog.h"
 #include "RageSound.h"
 #include "RageUtil.h"
+#include "RageSoundManager.h"
 #include "archutils/win32/tls.h"
 
 #include "SDL.h"
diff --git a/stepmania/src/arch/Sound/RageSoundDriver_Null.cpp b/stepmania/src/arch/Sound/RageSoundDriver_Null.cpp
index 0e7e259e4c..674a98be02 100644
--- a/stepmania/src/arch/Sound/RageSoundDriver_Null.cpp
+++ b/stepmania/src/arch/Sound/RageSoundDriver_Null.cpp
@@ -5,6 +5,7 @@
 #include "RageLog.h"
 #include "RageSound.h"
 #include "RageUtil.h"
+#include "RageSoundManager.h"
 
 #include "SDL_utils.h"
 
diff --git a/stepmania/src/arch/Sound/RageSoundDriver_Null.h b/stepmania/src/arch/Sound/RageSoundDriver_Null.h
index 8a1cc7e032..5b423ae532 100644
--- a/stepmania/src/arch/Sound/RageSoundDriver_Null.h
+++ b/stepmania/src/arch/Sound/RageSoundDriver_Null.h
@@ -15,6 +15,7 @@
 #include "RageSound.h"
 #include <time.h>
 #include "RageSoundDriver.h"
+#include "RageThreads.h"
 
 class RageSound_Null: public RageSoundDriver
 {
diff --git a/stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp b/stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp
index 17ba4df1b7..a5f082d499 100644
--- a/stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp
+++ b/stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp
@@ -8,6 +8,7 @@
 #include "RageSound.h"
 #include "RageUtil.h"
 #include "archutils/win32/tls.h"
+#include "RageSoundManager.h"
 
 #include "SDL.h"