diff --git a/resources/templates/provision/yealink/t28p/y000000000000.cfg b/resources/templates/provision/yealink/t28p/y000000000000.cfg
index 91e3e618e4..65c2f98144 100644
--- a/resources/templates/provision/yealink/t28p/y000000000000.cfg
+++ b/resources/templates/provision/yealink/t28p/y000000000000.cfg
@@ -376,7 +376,7 @@ voice.group_spk_vol =
 
 #Enable or disable the phone to only accept the certificates in the Trusted Certificates list;
 #0-Disabled, 1-Enabled (default);
-security.trust_certificates = {if $trusted_cert_only == "false"}0{elseif $trusted_cert_only == "true"}1{/if}
+security.trust_certificates = {if $yealink_trust_certificates == "false"}0{elseif $yealink_trust_certificates == "true"}1{/if}
 
 #Define the login username and password of the user, var and administrator.
 #If your username is defined as: security.user_name.admin = adminuser.