diff --git a/vars/buildStripesPlatform.groovy b/vars/buildStripesPlatform.groovy
index acf6982..a306052 100644
--- a/vars/buildStripesPlatform.groovy
+++ b/vars/buildStripesPlatform.groovy
@@ -9,7 +9,7 @@ def call(String okapiUrl, String tenant, String branch='') {
 
   def foliociLib = new org.folio.foliociCommands()
 
-  if (!(branch =~ /^(r|R)\d{1}-\d{4}(-(rc|RC|hotfix-\d{1}))?$/)) {
+  if (!(branch =~ /^[rR]\d-\d{4}(-([rR][cC]|hotfix-\d))?$/) && !(branch =~ /\bmaster\b/)) {
     sh 'rm -f yarn.lock'
   }