diff --git a/packages/strapi-hook-mongoose/lib/index.js b/packages/strapi-hook-mongoose/lib/index.js
index 3364a4026d..cdfdc16569 100644
--- a/packages/strapi-hook-mongoose/lib/index.js
+++ b/packages/strapi-hook-mongoose/lib/index.js
@@ -17,6 +17,8 @@ const { models: utilsModels }  = require('strapi-utils');
 
 // Local helpers.
 const utils = require('./utils/');
+const _utils = utils();
+
 const relations = require('./relations');
 
 /**
@@ -524,23 +526,11 @@ module.exports = function (strapi) {
 
     postProcessValue: (value) => {
       if (_.isArray(value)) {
-        return value.map(valueToId);
+        return value.map(_utils.valueToId);
       }
-      return valueToId(value);
+      return _utils.valueToId(value);
     }
   }, relations);
 
   return hook;
 };
-
-const valueToId = value => {
-  return isMongoId(value)
-    ? mongoose.Types.ObjectId(value)
-    : value;
-};
-
-const isMongoId = (value) => {
-  const hexadecimal = /^[0-9A-F]+$/i;
-
-  return hexadecimal.test(value) && value.length === 24;
-};
diff --git a/packages/strapi-hook-mongoose/lib/utils/index.js b/packages/strapi-hook-mongoose/lib/utils/index.js
index 94b198b2fc..ac267c9a97 100644
--- a/packages/strapi-hook-mongoose/lib/utils/index.js
+++ b/packages/strapi-hook-mongoose/lib/utils/index.js
@@ -46,7 +46,16 @@ module.exports = (mongoose = new Mongoose()) => {
         default:
       }
     },
-    isObjectId: v => mongoose.Types.ObjectId.isValid(v),
-    toObjectId:  v => mongoose.Types.ObjectId(v),
+    valueToId: value => {
+      return this.isMongoId(value)
+        ? mongoose.Types.ObjectId(value)
+        : value;
+    },
+    isMongoId: (value) => {
+      // Here we don't use mongoose.Types.ObjectId.isValid method because it's a weird check,
+      // it returns for instance true for any integer value ¯\_(ツ)_/¯
+      const hexadecimal = /^[0-9A-F]+$/i;
+      return hexadecimal.test(value) && value.length === 24;
+    }
   };
 };