diff --git a/lib/httparty/hash_conversions.rb b/lib/httparty/hash_conversions.rb
index 6e72664..2955868 100644
--- a/lib/httparty/hash_conversions.rb
+++ b/lib/httparty/hash_conversions.rb
@@ -27,7 +27,7 @@ module HTTParty
       normalized_keys = normalize_keys(key, value)
 
       normalized_keys.flatten.each_slice(2).inject('') do |string, (k, v)|
-        string + "#{k}=#{ERB::Util.url_encode(v.to_s)}&"
+        string + "#{ERB::Util.url_encode(k)}=#{ERB::Util.url_encode(v.to_s)}&"
       end
     end
 
diff --git a/spec/httparty/hash_conversions_spec.rb b/spec/httparty/hash_conversions_spec.rb
index 23606df..f4df4f5 100644
--- a/spec/httparty/hash_conversions_spec.rb
+++ b/spec/httparty/hash_conversions_spec.rb
@@ -11,13 +11,13 @@ RSpec.describe HTTParty::HashConversions do
           phones: ['111-111-1111', '222-222-2222']
         }
       }
-      expect(HTTParty::HashConversions.to_params(hash)).to eq("name=bob&address[street]=111%20ruby%20ave.&address[city]=ruby%20central&address[phones][]=111-111-1111&address[phones][]=222-222-2222")
+      expect(HTTParty::HashConversions.to_params(hash)).to eq("name=bob&address%5Bstreet%5D=111%20ruby%20ave.&address%5Bcity%5D=ruby%20central&address%5Bphones%5D%5B%5D=111-111-1111&address%5Bphones%5D%5B%5D=222-222-2222")
     end
 
     context "nested params" do
       it 'creates a params string from a hash' do
         hash = { marketing_event: { marketed_resources: [ {type:"product", id: 57474842640 } ] } }
-        expect(HTTParty::HashConversions.to_params(hash)).to eq("marketing_event[marketed_resources][][type]=product&marketing_event[marketed_resources][][id]=57474842640")
+        expect(HTTParty::HashConversions.to_params(hash)).to eq("marketing_event%5Bmarketed_resources%5D%5B%5D%5Btype%5D=product&marketing_event%5Bmarketed_resources%5D%5B%5D%5Bid%5D=57474842640")
       end
     end
   end
@@ -27,7 +27,7 @@ RSpec.describe HTTParty::HashConversions do
       it "creates a params string" do
         expect(
           HTTParty::HashConversions.normalize_param(:people, ["Bob Jones", "Mike Smith"])
-        ).to eq("people[]=Bob%20Jones&people[]=Mike%20Smith&")
+        ).to eq("people%5B%5D=Bob%20Jones&people%5B%5D=Mike%20Smith&")
       end
     end
 
@@ -35,7 +35,7 @@ RSpec.describe HTTParty::HashConversions do
       it "creates a params string" do
         expect(
           HTTParty::HashConversions.normalize_param(:people, [])
-        ).to eq("people[]=&")
+        ).to eq("people%5B%5D=&")
       end
     end
 
@@ -43,7 +43,7 @@ RSpec.describe HTTParty::HashConversions do
       it "creates a params string" do
         expect(
           HTTParty::HashConversions.normalize_param(:person, { name: "Bob Jones" })
-        ).to eq("person[name]=Bob%20Jones&")
+        ).to eq("person%5Bname%5D=Bob%20Jones&")
       end
     end
 
diff --git a/spec/httparty/request/body_spec.rb b/spec/httparty/request/body_spec.rb
index b62b2fd..4eb1e1a 100644
--- a/spec/httparty/request/body_spec.rb
+++ b/spec/httparty/request/body_spec.rb
@@ -15,7 +15,7 @@ RSpec.describe HTTParty::Request::Body do
 
     context 'when params is hash' do
       let(:params) { { people: ["Bob Jones", "Mike Smith"] } }
-      let(:converted_params) { "people[]=Bob%20Jones&people[]=Mike%20Smith"}
+      let(:converted_params) { "people%5B%5D=Bob%20Jones&people%5B%5D=Mike%20Smith"}
 
       it { is_expected.to eq converted_params }
 
diff --git a/spec/httparty/request_spec.rb b/spec/httparty/request_spec.rb
index 804d8ee..4b4c237 100644
--- a/spec/httparty/request_spec.rb
+++ b/spec/httparty/request_spec.rb
@@ -89,7 +89,7 @@ RSpec.describe HTTParty::Request do
         it "sets correct query string" do
           request = HTTParty::Request.new(Net::HTTP::Get, 'http://google.com', query: { fake_array: [] })
 
-          expect(request.uri).to eq(URI.parse("http://google.com/?fake_array[]="))
+          expect(request.uri).to eq(URI.parse("http://google.com/?fake_array%5B%5D="))
         end
       end
 
@@ -97,7 +97,7 @@ RSpec.describe HTTParty::Request do
         it "sets correct query" do
           request = HTTParty::Request.new(Net::HTTP::Get, 'http://google.com', query: { fake_array: [1] })
 
-          expect(request.uri).to eq(URI.parse("http://google.com/?fake_array[]=1"))
+          expect(request.uri).to eq(URI.parse("http://google.com/?fake_array%5B%5D=1"))
         end
       end
     end
@@ -327,6 +327,7 @@ RSpec.describe HTTParty::Request do
         it "returns a Rails style query string" do
           @request.options[:query] = {foo: %w(bar baz)}
           expect(CGI.unescape(@request.uri.query)).to eq("foo[]=bar&foo[]=baz")
+          expect(@request.uri.query).to eq("foo%5B%5D=bar&foo%5B%5D=baz")
         end
       end
     end