diff --git a/lib/searchkick/relation.rb b/lib/searchkick/relation.rb
index 354e6d7..8bac8f9 100644
--- a/lib/searchkick/relation.rb
+++ b/lib/searchkick/relation.rb
@@ -232,7 +232,7 @@ module Searchkick
 
     # TODO merge options
     def aggs!(*args)
-      options[:aggs] = args
+      options[:aggs] = args.size == 1 ? args.first : args
       self
     end
 
diff --git a/test/aggs_test.rb b/test/aggs_test.rb
index 32ee7f3..ecfcbb8 100644
--- a/test/aggs_test.rb
+++ b/test/aggs_test.rb
@@ -18,6 +18,7 @@ class AggsTest < Minitest::Test
 
   def test_where
     assert_equal ({1 => 1}), store_agg(aggs: {store_id: {where: {in_stock: true}}})
+    assert_equal ({1 => 1}), buckets_as_hash(Product.search("Product", relation: true).aggs(store_id: {where: {in_stock: true}}).aggs["store_id"])
   end
 
   def test_order
--
libgit2 0.21.0