diff --git a/src/config/client.rs b/src/config/client.rs
index ad8426d..aba7ca7 100644
--- a/src/config/client.rs
+++ b/src/config/client.rs
@@ -5,13 +5,13 @@
 // Optional values are handled in the main Firefish program, and this tool
 // does not take care of it.
 
-use super::Revision;
+use super::{ensure_latest_revision, Revision};
 use serde::{Deserialize, Serialize};
 use validator::{Validate, ValidationError};
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
 pub struct Config {
-    #[validate(custom(function = "super::ensure_latest_revision"))]
+    #[validate(custom(function = "ensure_latest_revision"))]
     pub config_revision: Revision,
     #[validate(nested)]
     pub theme: Option<Theme>,
diff --git a/src/config/server.rs b/src/config/server.rs
index b180560..3783146 100644
--- a/src/config/server.rs
+++ b/src/config/server.rs
@@ -5,13 +5,13 @@
 // Optional values are handled in the main Firefish program, and this tool
 // does not take care of it.
 
-use super::Revision;
+use super::{ensure_latest_revision, Revision};
 use serde::{Deserialize, Serialize};
 use validator::Validate;
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
 pub struct Config {
-    #[validate(custom(function = "super::ensure_latest_revision"))]
+    #[validate(custom(function = "ensure_latest_revision"))]
     pub config_revision: Revision,
     #[validate(nested)]
     pub info: Option<Info>,