diff --git a/Dockerfile b/Dockerfile
index 0e7f8c6e2..d1c888941 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -86,6 +86,9 @@ ARG GAMIFICATION_ORG_ID
 # Universal Nav
 ARG UNIVERSAL_NAV_URL
 
+# Topgear submissions allowed domains
+ARG TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS
+
 ################################################################################
 # Setting of environment variables in the Docker image.
 
@@ -154,6 +157,9 @@ ENV GAMIFICATION_ORG_ID=$GAMIFICATION_ORG_ID
 # Universal nav
 ENV UNIVERSAL_NAV_URL=$UNIVERSAL_NAV_URL
 
+# Topgear submissions allowed domains
+ENV TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS=$TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS
+
 ################################################################################
 # Testing and build of the application inside the container.
 
diff --git a/build.sh b/build.sh
index a3650db35..9243995e2 100755
--- a/build.sh
+++ b/build.sh
@@ -29,6 +29,7 @@ docker build -t $TAG \
   --build-arg CONTENTFUL_EDU_CDN_API_KEY=$CONTENTFUL_EDU_CDN_API_KEY \
   --build-arg CONTENTFUL_EDU_PREVIEW_API_KEY=$CONTENTFUL_EDU_PREVIEW_API_KEY \
   --build-arg FILESTACK_API_KEY=$FILESTACK_API_KEY \
+  --build-arg TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS=$TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS \
   --build-arg FILESTACK_SUBMISSION_CONTAINER=$FILESTACK_SUBMISSION_CONTAINER \
   --build-arg MAILCHIMP_API_KEY=$MAILCHIMP_API_KEY \
   --build-arg MAILCHIMP_BASE_URL=$MAILCHIMP_BASE_URL \
diff --git a/config/custom-environment-variables.js b/config/custom-environment-variables.js
index 38d3c7493..88dd2a9a0 100644
--- a/config/custom-environment-variables.js
+++ b/config/custom-environment-variables.js
@@ -117,4 +117,5 @@ module.exports = {
     ORG_ID: 'GAMIFICATION_ORG_ID',
     ENABLE_BADGE_UI: 'GAMIFICATION_ENABLE_BADGE_UI',
   },
+  TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS: 'TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS',
 };
diff --git a/config/default.js b/config/default.js
index 97d6e1283..8474dd287 100644
--- a/config/default.js
+++ b/config/default.js
@@ -472,5 +472,5 @@ module.exports = {
   ACCOUNT_SETTINGS_REDIRECT_URL: 'https://account-settings.topcoder-dev.com',
   INNOVATION_CHALLENGES_TAG: 'Innovation Challenge',
   PLATFORM_SITE_URL: 'https://platform.topcoder-dev.com',
-  TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS: ['wipro365.sharepoint.com', 'wipro365-my.sharepoint.com', 'wipro365-my.sharepoint.com.mcas.ms'],
+  TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS: 'wipro365.sharepoint.com|wipro365-my.sharepoint.com|wipro365-my.sharepoint.com.mcas.ms',
 };
diff --git a/src/shared/components/SubmissionPage/FilestackFilePicker/index.jsx b/src/shared/components/SubmissionPage/FilestackFilePicker/index.jsx
index 8864968f2..9d828f637 100644
--- a/src/shared/components/SubmissionPage/FilestackFilePicker/index.jsx
+++ b/src/shared/components/SubmissionPage/FilestackFilePicker/index.jsx
@@ -136,7 +136,7 @@ class FilestackFilePicker extends React.Component {
   }
 
   isDomainAllowed(url) {
-    const domainReg = new RegExp(`^https?://(${config.TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS.join('|')})/.+`);
+    const domainReg = new RegExp(`^https?://(${config.TOPGEAR_ALLOWED_SUBMISSIONS_DOMAINS})/.+`);
     return !!url.match(domainReg);
   }