diff --git a/lib/blacklight/search_builder.rb b/lib/blacklight/search_builder.rb
index 7ea91678ce..2135630e91 100644
--- a/lib/blacklight/search_builder.rb
+++ b/lib/blacklight/search_builder.rb
@@ -59,7 +59,7 @@ def processed_parameters
       Blacklight::Solr::Request.new.tap do |request_parameters|
         @processor_chain.each do |method_name|
           if scope.respond_to?(method_name, true)
-            Deprecation.warn Blacklight::SearchBuilder, "Building search parameters by calling #{method_name} on #{scope.class}. This behavior will be deprecated in Blacklight 6.0. Instead, define #{method_name} on a subclass of #{self} and set search_builder_class in the configuration"
+            Deprecation.warn Blacklight::SearchBuilder, "Building search parameters by calling #{method_name} on #{scope.class}. This behavior will be deprecated in Blacklight 6.0. Instead, define #{method_name} on a subclass of #{self.class} and set search_builder_class in the configuration"
             scope.send(method_name, request_parameters, blacklight_params)
           else
             send(method_name, request_parameters)