diff --git a/src/domain/checker.rs b/src/domain/checker.rs
index 45983a4..b2592aa 100644
--- a/src/domain/checker.rs
+++ b/src/domain/checker.rs
@@ -96,6 +96,7 @@ impl Checker for DNSChecker {
                 .map_err(|e| CheckDomainError::Unexpected(Box::from(e)))?
                 .append_domain(&fqdn)
                 .map_err(|e| CheckDomainError::Unexpected(Box::from(e)))?;
+
             let response = self
                 .client
                 .query(&fqdn, DNSClass::IN, RecordType::TXT)
diff --git a/src/domain/config.rs b/src/domain/config.rs
index d954495..b66b288 100644
--- a/src/domain/config.rs
+++ b/src/domain/config.rs
@@ -13,30 +13,21 @@ pub struct Config {
     pub origin_descr: Descr,
 }
 
-#[derive(Debug)]
+#[derive(thiserror::Error, Debug)]
 pub enum GetError {
+    #[error("not found")]
     NotFound,
-    Unexpected(Box<dyn Error>),
-}
 
-impl<E: Error + 'static> From<E> for GetError {
-    fn from(e: E) -> GetError {
-        GetError::Unexpected(Box::from(e))
-    }
+    #[error(transparent)]
+    Unexpected(Box<dyn Error>),
 }
 
-#[derive(Debug)]
+#[derive(thiserror::Error, Debug)]
 pub enum SetError {
-    NotFound,
+    #[error(transparent)]
     Unexpected(Box<dyn Error>),
 }
 
-impl<E: Error + 'static> From<E> for SetError {
-    fn from(e: E) -> SetError {
-        SetError::Unexpected(Box::from(e))
-    }
-}
-
 #[automock]
 pub trait Store {
     fn get(&self, domain: &str) -> Result<Config, GetError>;
@@ -69,17 +60,21 @@ impl Store for FSStore {
         let config_file =
             fs::File::open(self.config_file_path(domain)).map_err(|e| match e.kind() {
                 io::ErrorKind::NotFound => GetError::NotFound,
-                _ => e.into(),
+                _ => GetError::Unexpected(Box::from(e)),
             })?;
 
-        Ok(serde_json::from_reader(config_file)?)
+        Ok(serde_json::from_reader(config_file).map_err(|e| GetError::Unexpected(Box::from(e)))?)
     }
 
     fn set(&self, domain: &str, config: &Config) -> Result<(), SetError> {
-        fs::create_dir_all(self.config_dir_path(domain))?;
+        fs::create_dir_all(self.config_dir_path(domain))
+            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
+
+        let config_file = fs::File::create(self.config_file_path(domain))
+            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
 
-        let config_file = fs::File::create(self.config_file_path(domain))?;
-        serde_json::to_writer(config_file, config)?;
+        serde_json::to_writer(config_file, config)
+            .map_err(|e| SetError::Unexpected(Box::from(e)))?;
 
         Ok(())
     }