diff --git a/roots.h b/roots.h
index 542f03b..46bb77e 100644
--- a/roots.h
+++ b/roots.h
@@ -17,13 +17,15 @@
 #ifndef RECOVERY_ROOTS_H_
 #define RECOVERY_ROOTS_H_
 
+#include <string>
+
 typedef struct fstab_rec Volume;
 
 // Load and parse volume data from /etc/recovery.fstab.
 void load_volume_table();
 
-// Return the Volume* record for this path (or NULL).
-Volume* volume_for_path(const char* path);
+// Return the Volume* record for this mount point (or nullptr).
+Volume* volume_for_mount_point(const std::string& mount_point);
 
 // Make sure that the volume 'path' is on is mounted.  Returns 0 on
 // success (volume is mounted).