diff --git a/cryptfs.h b/cryptfs.h
index 8b4c37b..a0693d3 100644
--- a/cryptfs.h
+++ b/cryptfs.h
@@ -81,6 +81,7 @@
   int cryptfs_setup_volume(const char *label, int major, int minor,
                            char *crypto_dev_path, unsigned int max_pathlen,
                            int *new_major, int *new_minor);
+  int cryptfs_revert_volume(const char *label);
 #ifdef __cplusplus
 }
 #endif