diff --git a/lib/geared_pagination/recordset.rb b/lib/geared_pagination/recordset.rb
index 2981a96..96262d3 100644
--- a/lib/geared_pagination/recordset.rb
+++ b/lib/geared_pagination/recordset.rb
@@ -32,7 +32,13 @@ def page_count
     end
 
     def records_count
-      @records_count ||= records.unscope(:limit).unscope(:offset).unscope(:select).count
+      if @records_count.nil?
+        @records_count = records.unscope(:limit).unscope(:offset).unscope(:select).size
+        # records count could be a hash if query has a group by clause -> in this case records count is number of groups
+        @records_count = @records_count.size if @records_count.is_a?(Hash)
+      end
+
+      @records_count
     end
 
     private
diff --git a/test/recordset_test.rb b/test/recordset_test.rb
index 4dc66e4..8b93b40 100644
--- a/test/recordset_test.rb
+++ b/test/recordset_test.rb
@@ -76,4 +76,10 @@ class GearedPagination::RecordsetTest < ActiveSupport::TestCase
     recordset = GearedPagination::Recordset.new(select_scoped_records, per_page: [ 10, 15, 20 ])
     assert_equal Recording.all.count, recordset.records_count
   end
+
+  test "records count for group by" do
+    select_scoped_records = Recording.all.select(:id, :number).group(:id)
+    recordset = GearedPagination::Recordset.new(select_scoped_records, per_page: [ 10, 15, 20 ])
+    assert_equal Recording.all.count, recordset.records_count
+  end
 end