diff --git a/resources/templates/provision/yealink/t52s/y000000000074.cfg b/resources/templates/provision/yealink/t52s/y000000000074.cfg
index 0d5cacb30e..d6b1007fe7 100644
--- a/resources/templates/provision/yealink/t52s/y000000000074.cfg
+++ b/resources/templates/provision/yealink/t52s/y000000000074.cfg
@@ -339,7 +339,7 @@ static.security.default_ssl_method =
 static.security.cn_validation = 
 static.security.dev_cert = 
 static.security.ca_cert = 
-static.security.trust_certificates = 
+static.security.trust_certificates = {if $yealink_trust_certificates == "false"}0{elseif $yealink_trust_certificates == "true"}1{/if}
 security.tls_cipher_list = 
 {if isset($user_name) }
 static.security.user_name.user = {$user_name}