diff --git a/dev-ruby/gnuplot/gnuplot-2.6.2-r2.ebuild b/dev-ruby/gnuplot/gnuplot-2.6.2-r2.ebuild
index df270c6c1a5e4..60d15cf67e261 100644
--- a/dev-ruby/gnuplot/gnuplot-2.6.2-r2.ebuild
+++ b/dev-ruby/gnuplot/gnuplot-2.6.2-r2.ebuild
@@ -3,8 +3,8 @@
 # $Id$
 
 EAPI=5
-# ruby22 -> not compatible since Config is removed
-USE_RUBY="ruby20 ruby21"
+
+USE_RUBY="ruby20 ruby21 ruby22 ruby23"
 
 RUBY_FAKEGEM_TASK_DOC=""
 RUBY_FAKEGEM_EXTRADOC="AUTHORS.txt ChangeLog README.textile"
@@ -26,6 +26,8 @@ RDEPEND+=" sci-visualization/gnuplot"
 all_ruby_prepare() {
 	# Existing metadata causes a crash in jruby, so use our own.
 	rm -f ../metadata || die "Unable to remove metadata."
+
+	sed -i -e 's/Config/RbConfig/' test/test_gnuplot.rb || die
 }
 
 each_ruby_test() {