diff --git a/lib/searchkick/query.rb b/lib/searchkick/query.rb
index d20674e..97b3a7c 100644
--- a/lib/searchkick/query.rb
+++ b/lib/searchkick/query.rb
@@ -347,7 +347,7 @@ module Searchkick
           aggs = options[:aggs]
           payload[:aggs] = {}
 
-          aggs = aggs.map { |f| [f, {}] }.to_h if aggs.is_a?(Array) # convert to more advanced syntax
+          aggs = Hash[aggs.map { |f| [f, {}] }] if aggs.is_a?(Array) # convert to more advanced syntax
 
           aggs.each do |field, agg_options|
             size = agg_options[:limit] ? agg_options[:limit] : 100_000
diff --git a/test/aggs_test.rb b/test/aggs_test.rb
index cf36efc..b95feb1 100644
--- a/test/aggs_test.rb
+++ b/test/aggs_test.rb
@@ -95,7 +95,7 @@ class AggsTest < Minitest::Test
   protected
 
   def buckets_as_hash(agg)
-    agg["buckets"].map { |v| [v["key"], v["doc_count"]] }.to_h
+    Hash[agg["buckets"].map { |v| [v["key"], v["doc_count"]] }]
   end
 
   def store_agg(options, agg_key = "store_id")
@@ -104,8 +104,8 @@ class AggsTest < Minitest::Test
   end
 
   def store_multiple_aggs(options)
-    Product.search("Product", options).aggs.map do |field, filtered_agg|
+    Hash[Product.search("Product", options).aggs.map do |field, filtered_agg|
       [field, buckets_as_hash(filtered_agg)]
-    end.to_h
+    end]
   end
 end
--
libgit2 0.21.0