diff --git a/Cargo.toml b/Cargo.toml
index a519135..6c4874c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,3 +18,4 @@ futures = "0.3.7"
 itertools = "0.9.0"
 log = "0.4.11"
 webpki = "0.21.0"
+lazy_static = "1.4.0"
diff --git a/examples/certificates.rs b/examples/certificates.rs
index 095f65f..103aa7f 100644
--- a/examples/certificates.rs
+++ b/examples/certificates.rs
@@ -1,7 +1,7 @@
 use anyhow::*;
 use futures::{future::BoxFuture, FutureExt};
 use tokio::sync::RwLock;
-use northstar::{Server, Request, Response, GEMINI_PORT, Certificate, gemini_mime};
+use northstar::{Certificate, GEMINI_MIME, GEMINI_PORT, Request, Response, Server};
 use std::collections::HashMap;
 use std::sync::Arc;
 
@@ -32,7 +32,7 @@ fn handle_request(users: Arc<RwLock<HashMap<CertBytes, String>>>, request: Reque
             if let Some(user) = users_read.get(cert_bytes) {
                 // The user has already registered
                 Ok(
-                    Response::success(&gemini_mime()?)?
+                    Response::success(&GEMINI_MIME)?
                         .with_body(format!("Welcome {}!", user))
                 )
             } else {
@@ -44,7 +44,7 @@ fn handle_request(users: Arc<RwLock<HashMap<CertBytes, String>>>, request: Reque
                     let mut users_write = users.write().await;
                     users_write.insert(cert_bytes.clone(), username.to_owned());
                     Ok(
-                        Response::success(&gemini_mime()?)?
+                        Response::success(&GEMINI_MIME)?
                             .with_body(format!(
                                 "Your account has been created {}!  Welcome!",
                                 username
diff --git a/src/lib.rs b/src/lib.rs
index b5e59f6..0cc7d6b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ use tokio_rustls::{rustls, TlsAcceptor};
 use rustls::*;
 use anyhow::*;
 use uri::URIReference;
+use lazy_static::lazy_static;
 
 pub mod types;
 pub mod util;
@@ -203,9 +204,13 @@ fn load_key() -> Result<PrivateKey> {
 
 const GEMINI_MIME_STR: &str = "text/gemini";
 
+lazy_static! {
+    pub static ref GEMINI_MIME: Mime = GEMINI_MIME_STR.parse().expect("northstar BUG");
+}
+
+#[deprecated(note = "Use `GEMINI_MIME` instead", since = "0.3.0")]
 pub fn gemini_mime() -> Result<Mime> {
-    let mime = GEMINI_MIME_STR.parse()?;
-    Ok(mime)
+    Ok(GEMINI_MIME.clone())
 }
 
 /// A client cert verifier that accepts all connections
@@ -243,3 +248,13 @@ impl ClientCertVerifier for AllowAnonOrSelfsignedClient {
         Ok(ClientCertVerified::assertion())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn gemini_mime_parses() {
+        let _: &Mime = &GEMINI_MIME;
+    }
+}
diff --git a/src/util.rs b/src/util.rs
index e7a6cf0..8b388fc 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -6,7 +6,7 @@ use tokio::{
     fs::{self, File},
     io,
 };
-use crate::{GEMINI_MIME_STR, Response, gemini_mime};
+use crate::{GEMINI_MIME, GEMINI_MIME_STR, Response};
 use itertools::Itertools;
 
 pub async fn serve_file<P: AsRef<Path>>(path: P, mime: &Mime) -> Result<Response> {
@@ -82,7 +82,7 @@ async fn serve_dir_listing<P: AsRef<Path>, B: AsRef<Path>>(path: P, virtual_path
         )?;
     }
 
-    Ok(Response::success(&gemini_mime()?)?.with_body(listing))
+    Ok(Response::success(&GEMINI_MIME)?.with_body(listing))
 }
 
 pub fn guess_mime_from_path<P: AsRef<Path>>(path: P) -> Mime {