diff --git a/lib/pagy/countless.rb b/lib/pagy/countless.rb
index 3ea12c46d..481d59bb2 100644
--- a/lib/pagy/countless.rb
+++ b/lib/pagy/countless.rb
@@ -11,6 +11,8 @@ class Countless < Pagy
     # Merge and validate the options, do some simple arithmetic and set a few instance variables
     def initialize(vars={})  # rubocop:disable Lint/MissingSuper
       @vars = VARS.merge(vars.delete_if{|_,v| v.nil? || v == '' })      # default vars + cleaned vars (can be overridden)
+      @vars[:fragment] = Pagy.deprecated_var(:anchor, @vars[:anchor], :fragment, @vars[:fragment]) if @vars[:anchor]
+
       INSTANCE_VARS_MIN.each do |k,min|                                 # validate instance variables
         raise VariableError.new(self), "expected :#{k} >= #{min}; got #{@vars[k].inspect}" \
               unless @vars[k] && instance_variable_set(:"@#{k}", @vars[k].to_i) >= min