diff --git a/lib/stripe/errors.rb b/lib/stripe/errors.rb
index d4865655f..c91422c12 100644
--- a/lib/stripe/errors.rb
+++ b/lib/stripe/errors.rb
@@ -27,7 +27,7 @@ def initialize(message = nil, http_status: nil, http_body: nil,
       @http_headers = http_headers || {}
       @json_body = json_body
       @code = code
-      @request_id = @http_headers[:request_id]
+      @request_id = @http_headers["request-id"]
       @error = construct_error_object
     end
 
diff --git a/test/stripe/errors_test.rb b/test/stripe/errors_test.rb
index 817ea13ef..a32c7685e 100644
--- a/test/stripe/errors_test.rb
+++ b/test/stripe/errors_test.rb
@@ -22,7 +22,7 @@ class StripeErrorTest < Test::Unit::TestCase
           e = StripeError.new("message", http_status: 200)
           assert_equal "(Status 200) message", e.to_s
 
-          e = StripeError.new("message", http_status: nil, http_body: nil, json_body: nil, http_headers: { request_id: "request-id" })
+          e = StripeError.new("message", http_status: nil, http_body: nil, json_body: nil, http_headers: { "request-id" => "request-id" })
           assert_equal "(Request request-id) message", e.to_s
         end
       end