diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 4f20c8b..444225f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -44,6 +44,7 @@ def scrub_hex(str)
      .gsub(/#<Pango::FontDescription:.*>/,'')
      .gsub(/#<Cairo::ImageSurface:.*>/,'ImageSurface')
      .gsub(/#<Cairo::LinearPattern:.*>/,'LinearPattern')
+     .gsub(/#<Cairo::RadialPattern:.*>/,'RadialPattern')
      .gsub(/#<Cairo::Matrix:.*>/,'Matrix')
      .gsub(/#<RSVG::Handle.*>/,'RSVG::Handle')
      .gsub(/#<RSpec::Mocks::Double:.*>/,'MockDouble')