diff --git a/app/models/site_setting.rb b/app/models/site_setting.rb
index 33799aba840..0bbaf508606 100644
--- a/app/models/site_setting.rb
+++ b/app/models/site_setting.rb
@@ -238,11 +238,11 @@ class SiteSetting < ActiveRecord::Base
 
   ALLOWLIST_DEPRECATED_SITE_SETTINGS.each_pair do |old_method, new_method|
     self.define_singleton_method(old_method) do
-      Discourse.deprecate("#{old_method.to_s} is deprecated, use the #{new_method.to_s}.", drop_from: "2.6")
+      Discourse.deprecate("#{old_method.to_s} is deprecated, use the #{new_method.to_s}.", drop_from: "2.6", raise_error: true)
       send(new_method)
     end
     self.define_singleton_method("#{old_method}=") do |args|
-      Discourse.deprecate("#{old_method.to_s} is deprecated, use the #{new_method.to_s}.", drop_from: "2.6")
+      Discourse.deprecate("#{old_method.to_s} is deprecated, use the #{new_method.to_s}.", drop_from: "2.6", raise_error: true)
       send("#{new_method}=", args)
     end
   end
diff --git a/lib/plugin/instance.rb b/lib/plugin/instance.rb
index d24e49e3749..71b92a42de0 100644
--- a/lib/plugin/instance.rb
+++ b/lib/plugin/instance.rb
@@ -157,7 +157,7 @@ class Plugin::Instance
   end
 
   def whitelist_staff_user_custom_field(field)
-    Discourse.deprecate("whitelist_staff_user_custom_field is deprecated, use the allow_staff_user_custom_field.", drop_from: "2.6")
+    Discourse.deprecate("whitelist_staff_user_custom_field is deprecated, use the allow_staff_user_custom_field.", drop_from: "2.6", raise_error: true)
     allow_staff_user_custom_field(field)
   end
 
@@ -166,7 +166,7 @@ class Plugin::Instance
   end
 
   def whitelist_public_user_custom_field(field)
-    Discourse.deprecate("whitelist_public_user_custom_field is deprecated, use the allow_public_user_custom_field.", drop_from: "2.6")
+    Discourse.deprecate("whitelist_public_user_custom_field is deprecated, use the allow_public_user_custom_field.", drop_from: "2.6", raise_error: true)
     allow_public_user_custom_field(field)
   end
 
@@ -319,7 +319,7 @@ class Plugin::Instance
   end
 
   def topic_view_post_custom_fields_whitelister(&block)
-    Discourse.deprecate("topic_view_post_custom_fields_whitelister is deprecated, use the topic_view_post_custom_fields_allowlister.", drop_from: "2.6")
+    Discourse.deprecate("topic_view_post_custom_fields_whitelister is deprecated, use the topic_view_post_custom_fields_allowlister.", drop_from: "2.6", raise_error: true)
     topic_view_post_custom_fields_allowlister(&block)
   end