diff --git a/src/common/challenge-helper.js b/src/common/challenge-helper.js
index 81764aeb..6ee91781 100644
--- a/src/common/challenge-helper.js
+++ b/src/common/challenge-helper.js
@@ -119,7 +119,7 @@ class ChallengeHelper {
     // check groups authorization
     if (challenge.groups && challenge.groups.length > 0) {
       if (currentUser.isMachine || hasAdminRole(currentUser)) {
-        await validateGroups(challenge.groups);
+        await this.validateGroups(challenge.groups);
       } else {
         await helper.ensureAccessibleByGroupsAccess(currentUser, challenge);
       }
@@ -145,7 +145,7 @@ class ChallengeHelper {
     // check groups access to be updated group values
     if (data.groups && data.groups.length > 0) {
       if (currentUser.isMachine || hasAdminRole(currentUser)) {
-        await validateGroups(data.groups);
+        await this.validateGroups(data.groups);
       } else {
         await ensureAcessibilityToModifiedGroups(currentUser, data, challenge);
       }
diff --git a/src/services/ChallengeService.js b/src/services/ChallengeService.js
index 4b1e9e2d..469d8806 100644
--- a/src/services/ChallengeService.js
+++ b/src/services/ChallengeService.js
@@ -36,7 +36,6 @@ const { ChallengeDomain } = require("@topcoder-framework/domain-challenge");
 
 const { hasAdminRole } = require("../common/role-helper");
 const {
-  validateChallengeUpdateRequest,
   enrichChallengeForResponse,
   sanitizeRepeatedFieldsInUpdateRequest,
   convertPrizeSetValuesToCents,
@@ -1491,7 +1490,7 @@ async function updateChallenge(currentUser, challengeId, data) {
 
   const challengeResources = await helper.getChallengeResources(challengeId);
 
-  await validateChallengeUpdateRequest(currentUser, challenge, data, challengeResources);
+  await challengeHelper.validateChallengeUpdateRequest(currentUser, challenge, data, challengeResources);
   validateTask(currentUser, challenge, data, challengeResources);
 
   let sendActivationEmail = false;