diff --git a/meilisearch-http/src/routes/setting.rs b/meilisearch-http/src/routes/setting.rs
index 703607c32..9cdbcb7a3 100644
--- a/meilisearch-http/src/routes/setting.rs
+++ b/meilisearch-http/src/routes/setting.rs
@@ -1,5 +1,4 @@
 use meilisearch_core::settings::{Settings, SettingsUpdate, UpdateState, DEFAULT_RANKING_RULES};
-use serde::Deserialize;
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use tide::{Request, Response};
 
@@ -73,36 +72,13 @@ pub async fn get_all(ctx: Request<Data>) -> SResult<Response> {
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
-#[derive(Default, Clone, Deserialize)]
-#[serde(rename_all = "camelCase", deny_unknown_fields)]
-pub struct UpdateSettings {
-    pub ranking_rules: Option<Vec<String>>,
-    pub distinct_attribute: Option<String>,
-    pub primary_key: Option<String>,
-    pub searchable_attributes: Option<Vec<String>>,
-    pub displayed_attributes: Option<HashSet<String>>,
-    pub stop_words: Option<BTreeSet<String>>,
-    pub synonyms: Option<BTreeMap<String, Vec<String>>>,
-    pub accept_new_fields: Option<bool>,
-}
-
 pub async fn update_all(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(Private)?;
     let index = ctx.index()?;
-    let settings_update: UpdateSettings =
+    let settings: Settings =
         ctx.body_json().await.map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
-        ranking_rules: Some(settings_update.ranking_rules),
-        distinct_attribute: Some(settings_update.distinct_attribute),
-        searchable_attributes: Some(settings_update.searchable_attributes),
-        displayed_attributes: Some(settings_update.displayed_attributes),
-        stop_words: Some(settings_update.stop_words),
-        synonyms: Some(settings_update.synonyms),
-        accept_new_fields: Some(settings_update.accept_new_fields),
-    };
-
     let mut writer = db.update_write_txn()?;
     let settings = settings.into_update().map_err(ResponseError::bad_request)?;
     let update_id = index.settings_update(&mut writer, settings)?;
diff --git a/meilisearch-http/tests/search.rs b/meilisearch-http/tests/search.rs
index a53aecf89..d044d3531 100644
--- a/meilisearch-http/tests/search.rs
+++ b/meilisearch-http/tests/search.rs
@@ -644,7 +644,6 @@ fn search_with_settings_basic() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -751,7 +750,6 @@ fn search_with_settings_stop_words() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -858,7 +856,6 @@ fn search_with_settings_synonyms() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -970,7 +967,6 @@ fn search_with_settings_ranking_rules() {
         "desc(popularity)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -1077,7 +1073,6 @@ fn search_with_settings_searchable_attributes() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "tagline",
         "overview",
@@ -1183,7 +1178,6 @@ fn search_with_settings_displayed_attributes() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "title",
         "tagline",
@@ -1254,7 +1248,6 @@ fn search_with_settings_searchable_attributes_2() {
         "desc(vote_average)"
       ],
       "distinctAttribute": null,
-      "primaryKey": "id",
       "searchableAttributes": [
         "tagline",
         "overview",
diff --git a/meilisearch-http/tests/settings.rs b/meilisearch-http/tests/settings.rs
index c692e4104..7e2b1275d 100644
--- a/meilisearch-http/tests/settings.rs
+++ b/meilisearch-http/tests/settings.rs
@@ -192,6 +192,7 @@ fn write_all_and_update() {
             "exactness",
             "desc(release_date)",
         ],
+        "distinctAttribute": null,
         "searchableAttributes": [
             "title",
             "description",
@@ -204,8 +205,7 @@ fn write_all_and_update() {
             "rank",
             "poster",
         ],
-        "stopWords": [
-        ],
+        "stopWords": [],
         "synonyms": {
             "wolverine": ["xmen", "logan"],
             "logan": ["wolverine", "xmen"],
@@ -321,3 +321,111 @@ fn test_default_settings_2() {
 
     assert_json_eq!(body, response, ordered: false);
 }
+
+// Test issue https://github.com/meilisearch/MeiliSearch/issues/516
+#[test]
+fn write_setting_and_update_partial() {
+    let mut server = common::Server::with_uid("movies");
+    let body = json!({
+        "uid": "movies",
+    });
+    server.create_index(body);
+
+    // 2 - Send the settings
+
+    let body = json!({
+        "searchableAttributes": [
+            "uid",
+            "movie_id",
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ],
+        "displayedAttributes": [
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ]
+    });
+
+    server.update_all_settings(body.clone());
+
+    // 2 - Send the settings
+
+    let body = json!({
+        "rankingRules": [
+            "typo",
+            "words",
+            "proximity",
+            "attribute",
+            "wordsPosition",
+            "exactness",
+            "desc(release_date)",
+            "desc(rank)",
+        ],
+        "distinctAttribute": "movie_id",
+        "stopWords": [
+            "the",
+            "a",
+            "an",
+        ],
+        "synonyms": {
+            "wolverine": ["xmen", "logan"],
+            "logan": ["wolverine"],
+        },
+        "acceptNewFields": false,
+    });
+
+    server.update_all_settings(body.clone());
+
+    // 2 - Send the settings
+
+    let expected = json!({
+        "rankingRules": [
+            "typo",
+            "words",
+            "proximity",
+            "attribute",
+            "wordsPosition",
+            "exactness",
+            "desc(release_date)",
+            "desc(rank)",
+        ],
+        "distinctAttribute": "movie_id",
+        "searchableAttributes": [
+            "uid",
+            "movie_id",
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ],
+        "displayedAttributes": [
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ],
+        "stopWords": [
+            "the",
+            "a",
+            "an",
+        ],
+        "synonyms": {
+            "wolverine": ["xmen", "logan"],
+            "logan": ["wolverine"],
+        },
+        "acceptNewFields": false,
+    });
+
+    let (response, _status_code) = server.get_all_settings();
+
+    assert_json_eq!(expected, response, ordered: false);
+
+}