diff --git a/src/kernel/pspaudiorouting.h b/src/kernel/pspaudiorouting.h
index 16891bc426..b33e2bc60c 100644
--- a/src/kernel/pspaudiorouting.h
+++ b/src/kernel/pspaudiorouting.h
@@ -11,6 +11,10 @@
 #ifndef __PSPAUDIOROUTING_H__
 #define __PSPAUDIOROUTING_H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 /**
  * Set routing mode.
  *
@@ -27,5 +31,23 @@ int sceAudioRoutingSetMode( int mode );
 */
 int sceAudioRoutingGetMode();
 
-#endif
+/** Get the current routing volume mode.
+ *
+ * @return The current routing volume mode.
+ */
+int sceAudioRoutingGetVolumeMode();
+
+/** Set the routing volume mode.
+ *
+ * @param vol_mode The routing volume to set (`0` or `1`).
+ *
+ * @return `0` on success, `< 0` on error.
+ */
+int sceAudioRoutingSetVolumeMode(int vol_mode);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __PSPAUDIOROUTING_H__ */