diff --git a/src/add-ons/kernel/drivers/audio/ac97/auvia/multi_audio.h b/src/add-ons/kernel/drivers/audio/ac97/auvia/multi_audio.h
index 5964973d61..5701022e6a 100644
--- a/src/add-ons/kernel/drivers/audio/ac97/auvia/multi_audio.h
+++ b/src/add-ons/kernel/drivers/audio/ac97/auvia/multi_audio.h
@@ -13,7 +13,9 @@
 #define _MULTI_AUDIO_H
 
 #include <Drivers.h>
+#ifndef ASSERT
 #include <Debug.h>
+#endif
 
 #define B_MULTI_DRIVER_BASE (B_AUDIO_DRIVER_BASE+20)
 
diff --git a/src/add-ons/kernel/drivers/audio/echo/multi_audio.h b/src/add-ons/kernel/drivers/audio/echo/multi_audio.h
index 6802a49ba3..5701022e6a 100644
--- a/src/add-ons/kernel/drivers/audio/echo/multi_audio.h
+++ b/src/add-ons/kernel/drivers/audio/echo/multi_audio.h
@@ -13,9 +13,8 @@
 #define _MULTI_AUDIO_H
 
 #include <Drivers.h>
-
-#if !defined(ASSERT)
-	#include <Debug.h>
+#ifndef ASSERT
+#include <Debug.h>
 #endif
 
 #define B_MULTI_DRIVER_BASE (B_AUDIO_DRIVER_BASE+20)