diff --git a/src/controllers/collection.js b/src/controllers/collection.js
index d16178388..dec3cf363 100644
--- a/src/controllers/collection.js
+++ b/src/controllers/collection.js
@@ -171,17 +171,24 @@ class CollectionController {
       .then(response => response.result);
   }
 
-  updateSpecifications (index, collection, body, options = {}) {
+  updateSpecifications (index, collection, specifications, options = {}) {
     if (!index) {
       throw new Error('Kuzzle.collection.updateSpecifications: index is required');
     }
     if (!collection) {
       throw new Error('Kuzzle.collection.updateSpecifications: collection is required');
     }
+    if (!specifications) {
+      throw new Error('Kuzzle.collection.updateSpecifications: specifications are required');
+    }
+
+    const body = {
+      [index]: {
+        [collection]: specifications
+      }
+    };
 
     return this.kuzzle.query({
-      index,
-      collection,
       body,
       controller: 'collection',
       action: 'updateSpecifications'
@@ -189,7 +196,23 @@ class CollectionController {
       .then(response => response.result);
   }
 
-  validateSpecifications (body, options = {}) {
+  validateSpecifications (index, collection, specifications, options = {}) {
+    if (!index) {
+      throw new Error('Kuzzle.collection.validateSpecifications: index is required');
+    }
+    if (!collection) {
+      throw new Error('Kuzzle.collection.validateSpecifications: collection is required');
+    }
+    if (!specifications) {
+      throw new Error('Kuzzle.collection.updateSpecifications: specifications are required');
+    }
+
+    const body = {
+      [index]: {
+        [collection]: specifications
+      }
+    };
+
     return this.kuzzle.query({
       body,
       controller: 'collection',
diff --git a/test/controllers/collection.test.js b/test/controllers/collection.test.js
index f7ca8a5d1..12fb9a39d 100644
--- a/test/controllers/collection.test.js
+++ b/test/controllers/collection.test.js
@@ -411,17 +411,19 @@ describe('Collection Controller', () => {
     it('should call collection/updateSpecifications query with the new specifications and return a Promise which resolves a json object', () => {
       kuzzle.query.resolves({result: {foo: 'bar'}});
 
-      const body = {foo: 'bar'};
-      return kuzzle.collection.updateSpecifications('index', 'collection', body, options)
+      const specifications = {foo: 'bar'};
+      return kuzzle.collection.updateSpecifications('index', 'collection', specifications, options)
         .then(res => {
           should(kuzzle.query)
             .be.calledOnce()
             .be.calledWith({
-              body,
+              body: {
+                index: {
+                  collection: specifications
+                }
+              },
               controller: 'collection',
-              action: 'updateSpecifications',
-              index: 'index',
-              collection: 'collection'
+              action: 'updateSpecifications'
             }, options);
 
           should(res).match({foo: 'bar'});
@@ -439,13 +441,17 @@ describe('Collection Controller', () => {
         }
       });
 
-      const body = {foo: 'bar'};
-      return kuzzle.collection.validateSpecifications(body, options)
+      const specifications = {foo: 'bar'};
+      return kuzzle.collection.validateSpecifications('index', 'collection', specifications, options)
         .then(res => {
           should(kuzzle.query)
             .be.calledOnce()
             .be.calledWith({
-              body,
+              body: {
+                index: {
+                  collection: specifications
+                }
+              },
               controller: 'collection',
               action: 'validateSpecifications'
             }, options);