diff --git a/lib/rack/query_parser.rb b/lib/rack/query_parser.rb
index dbbb18e5a..cbde13cfd 100644
--- a/lib/rack/query_parser.rb
+++ b/lib/rack/query_parser.rb
@@ -102,7 +102,7 @@ def normalize_params(params, name, v, depth)
       elsif after == "[]"
         params[k] ||= []
         raise ParameterTypeError, "expected Array (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Array)
-        params[k] << v
+        params[k] << v unless v.nil?
       elsif after =~ %r(^\[\]\[([^\[\]]+)\]$) || after =~ %r(^\[\](.+)$)
         child_key = $1
         params[k] ||= []
diff --git a/test/spec_utils.rb b/test/spec_utils.rb
index 428abbfd7..d06a3c715 100644
--- a/test/spec_utils.rb
+++ b/test/spec_utils.rb
@@ -162,7 +162,7 @@ def assert_nested_query(exp, act)
       must_equal "pid=1234" => "1023", "a" => "b"
 
     Rack::Utils.parse_nested_query("foo[]").
-      must_equal "foo" => [nil]
+      must_equal "foo" => []
     Rack::Utils.parse_nested_query("foo[]=").
       must_equal "foo" => [""]
     Rack::Utils.parse_nested_query("foo[]=bar").
@@ -174,7 +174,7 @@ def assert_nested_query(exp, act)
     Rack::Utils.parse_nested_query("foo[]=bar&foo[=baz").
       must_equal "foo" => ["bar"], "foo[" => "baz"
     Rack::Utils.parse_nested_query("foo[]=bar&foo[]").
-      must_equal "foo" => ["bar", nil]
+      must_equal "foo" => ["bar"]
     Rack::Utils.parse_nested_query("foo[]=bar&foo[]=").
       must_equal "foo" => ["bar", ""]