diff --git a/src/fetch/mod.rs b/src/fetch/mod.rs
index aed3f21..3436949 100644
--- a/src/fetch/mod.rs
+++ b/src/fetch/mod.rs
@@ -53,8 +53,8 @@ pub async fn fetch_object_http<T: Clone, Kind: DeserializeOwned>(
     url: &Url,
     data: &Data<T>,
 ) -> Result<FetchObjectResponse<Kind>, Error> {
-    const CONTENT_TYPE: HeaderValue = HeaderValue::from_static(FEDERATION_CONTENT_TYPE);
-    const ALT_CONTENT_TYPE: HeaderValue = HeaderValue::from_static(
+    static CONTENT_TYPE: HeaderValue = HeaderValue::from_static(FEDERATION_CONTENT_TYPE);
+    static ALT_CONTENT_TYPE: HeaderValue = HeaderValue::from_static(
         r#"application/ld+json; profile="https://www.w3.org/ns/activitystreams"#,
     );
     let res = fetch_object_http_with_accept(url, data, &CONTENT_TYPE).await?;
diff --git a/src/fetch/webfinger.rs b/src/fetch/webfinger.rs
index dbf0069..7da2fdf 100644
--- a/src/fetch/webfinger.rs
+++ b/src/fetch/webfinger.rs
@@ -35,7 +35,7 @@ impl WebFingerError {
 }
 
 /// The content-type for webfinger responses.
-pub const WEBFINGER_CONTENT_TYPE: HeaderValue = HeaderValue::from_static("application/jrd+json");
+pub static WEBFINGER_CONTENT_TYPE: HeaderValue = HeaderValue::from_static("application/jrd+json");
 
 /// Takes an identifier of the form `name@example.com`, and returns an object of `Kind`.
 ///