diff --git a/crates/meilisearch/src/routes/metrics.rs b/crates/meilisearch/src/routes/metrics.rs
index 31abb93a7..1efd6d367 100644
--- a/crates/meilisearch/src/routes/metrics.rs
+++ b/crates/meilisearch/src/routes/metrics.rs
@@ -1,4 +1,3 @@
-use actix_web::http::header;
 use actix_web::web::{self, Data};
 use actix_web::HttpResponse;
 use index_scheduler::{IndexScheduler, Query};
@@ -181,5 +180,12 @@ pub async fn get_metrics(
 
     let response = String::from_utf8(buffer).expect("Failed to convert bytes to string");
 
-    Ok(HttpResponse::Ok().insert_header(header::ContentType(mime::TEXT_PLAIN)).body(response))
+    // We cannot specify the version with ContentType(TEXT_PLAIN_UTF_8) so we have to write everything by hand :(
+    // see the following for what should be returned: https://prometheus.io/docs/instrumenting/content_negotiation/#content-type-response
+    let content_type = ("content-type", "text/plain; version=0.0.4; charset=utf-8");
+
+    Ok(HttpResponse::Ok()
+        // .insert_header(header::ContentType(mime::TEXT_PLAIN_UTF_8))
+        .insert_header(content_type)
+        .body(response))
 }