diff --git a/src/config/environment.rs b/src/config/environment.rs
index 6879eae..aa85ea6 100644
--- a/src/config/environment.rs
+++ b/src/config/environment.rs
@@ -1,6 +1,6 @@
 use std::str::FromStr;
 
-use crate::errors::ConversionError;
+use super::ConfigError;
 
 #[derive(Clone, Debug)]
 pub enum Environment {
@@ -16,13 +16,13 @@ impl Default for Environment {
 }
 
 impl FromStr for Environment {
-    type Err = ConversionError;
+    type Err = ConfigError;
 
     fn from_str(val: &str) -> Result<Self, Self::Err> {
         let environment = match val {
             "development" => Environment::Development,
             "production" => Environment::Production,
-            _ => return Err(ConversionError),
+            _ => return Err(ConfigError("invalid environment type")),
         };
         Ok(environment)
     }
diff --git a/src/config/limits.rs b/src/config/limits.rs
index df3f2db..2fcfe5e 100644
--- a/src/config/limits.rs
+++ b/src/config/limits.rs
@@ -4,13 +4,10 @@ use serde::{
     Deserializer,
     de::{Error as DeserializerError},
 };
+use super::ConfigError;
 
 const FILE_SIZE_RE: &str = r#"^(?i)(?P<size>\d+)(?P<unit>[kmg]?)b?$"#;
 
-#[derive(thiserror::Error, Debug)]
-#[error("{0}")]
-struct ConfigError(&'static str);
-
 fn parse_file_size(value: &str) -> Result<usize, ConfigError> {
     let file_size_re = Regex::new(FILE_SIZE_RE)
         .expect("regexp should be valid");
diff --git a/src/config/main.rs b/src/config/main.rs
index 1e36bb9..2ce0761 100644
--- a/src/config/main.rs
+++ b/src/config/main.rs
@@ -11,7 +11,6 @@ use url::Url;
 
 use crate::activitypub::constants::ACTOR_KEY_SUFFIX;
 use crate::activitypub::identifiers::local_instance_actor_id;
-use crate::errors::ConversionError;
 use crate::utils::urls::guess_protocol;
 
 use super::blockchain::BlockchainConfig;
@@ -123,14 +122,14 @@ pub struct Config {
 }
 
 impl Config {
-    pub(super) fn try_instance_url(&self) -> Result<Url, ConversionError> {
+    pub(super) fn try_instance_url(&self) -> Result<Url, url::ParseError> {
         let scheme = match self.environment {
             Environment::Development => "http",
             Environment::Production => guess_protocol(&self.instance_uri),
         };
         let url_str = format!("{}://{}", scheme, self.instance_uri);
-        let url = Url::parse(&url_str).map_err(|_| ConversionError)?;
-        url.host().ok_or(ConversionError)?; // validates URL
+        let url = Url::parse(&url_str)?;
+        url.host().ok_or(url::ParseError::EmptyHost)?; // validates URL
         Ok(url)
     }
 
diff --git a/src/config/mod.rs b/src/config/mod.rs
index fcec66b..f35b5c1 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -15,3 +15,7 @@ pub use loader::parse_config;
 pub use main::{Config, Instance, RegistrationType};
 
 pub const MITRA_VERSION: &str = env!("CARGO_PKG_VERSION");
+
+#[derive(thiserror::Error, Debug)]
+#[error("{0}")]
+pub struct ConfigError(&'static str);