diff --git a/cryptfs.h b/cryptfs.h
index bce1dd3..1da6f94 100644
--- a/cryptfs.h
+++ b/cryptfs.h
@@ -243,7 +243,7 @@
   int cryptfs_setfield(const char *fieldname, const char *value);
   int cryptfs_mount_default_encrypted(void);
   int cryptfs_get_password_type(void);
-  char* cryptfs_get_password(void);
+  const char* cryptfs_get_password(void);
   void cryptfs_clear_password(void);
 #ifdef __cplusplus
 }