diff --git a/Disk.h b/Disk.h
index 60e4fa9..77ec7df 100644
--- a/Disk.h
+++ b/Disk.h
@@ -18,6 +18,7 @@
 #define ANDROID_VOLD_DISK_H
 
 #include "Utils.h"
+#include "VolumeBase.h"
 
 #include <utils/Errors.h>
 
@@ -64,6 +65,8 @@
 
     std::shared_ptr<VolumeBase> findVolume(const std::string& id);
 
+    void listVolumes(VolumeBase::Type type, std::list<std::string>& list);
+
     status_t create();
     status_t destroy();