diff --git a/panda/src/audio/Sources.pp b/panda/src/audio/Sources.pp
index 09a7329904..8de589b787 100644
--- a/panda/src/audio/Sources.pp
+++ b/panda/src/audio/Sources.pp
@@ -1,9 +1,6 @@
 #define OTHER_LIBS dtoolconfig dtool
 #define DIRECTORY_IF_AUDIO yes
 
-// Do we use the Miles sound interface instead of the default DirectSound-based interface
-#define USE_RAD_MSS yes
-
 #begin lib_target
   #define TARGET audio
   #define LOCAL_LIBS putil