diff --git a/lib/ethon/easy/queryable.rb b/lib/ethon/easy/queryable.rb
index 694583f..a1a02fa 100644
--- a/lib/ethon/easy/queryable.rb
+++ b/lib/ethon/easy/queryable.rb
@@ -94,7 +94,7 @@ def recursively_generate_pairs(h, prefix, pairs)
           end
         when Array
           h.each_with_index do |v, i|
-            key = "#{prefix}[#{i}]"
+            key = "#{prefix}[]"
             pairs_for(v, key, pairs)
           end
         end
diff --git a/spec/ethon/easy/queryable_spec.rb b/spec/ethon/easy/queryable_spec.rb
index c2afb5b..0d6cf0f 100644
--- a/spec/ethon/easy/queryable_spec.rb
+++ b/spec/ethon/easy/queryable_spec.rb
@@ -108,8 +108,8 @@
 
       it "transforms" do
         expect(pairs).to include([:a, 1])
-        expect(pairs).to include(["b[0]", 2])
-        expect(pairs).to include(["b[1]", 3])
+        expect(pairs).to include(["b[]", 2])
+        expect(pairs).to include(["b[]", 3])
       end
     end
 
@@ -118,7 +118,7 @@
         let(:hash) { {:a => {:b => ["hello", "world"]}} }
 
         it "transforms" do
-          expect(pairs).to eq([["a[b][0]", "hello"], ["a[b][1]", "world"]])
+          expect(pairs).to eq([["a[b][]", "hello"], ["a[b][]", "world"]])
         end
       end
 
@@ -126,7 +126,7 @@
         let(:hash) { {:a => {:b => [{:c =>1}, {:d => 2}]}} }
 
         it "transforms" do
-          expect(pairs).to eq([["a[b][0][c]", 1], ["a[b][1][d]", 2]])
+          expect(pairs).to eq([["a[b][][c]", 1], ["a[b][][d]", 2]])
         end
       end
 
@@ -136,7 +136,7 @@
         let(:hash) { {:a => {:b => [file]}} }
 
         it "transforms" do
-          expect(pairs).to eq([["a[b][0]", file_info]])
+          expect(pairs).to eq([["a[b][]", file_info]])
         end
       end
     end