diff --git a/dev-ruby/rb-inotify/rb-inotify-0.10.0.ebuild b/dev-ruby/rb-inotify/rb-inotify-0.10.0.ebuild
index b210ddcbfc3f3..aca75df56eb85 100644
--- a/dev-ruby/rb-inotify/rb-inotify-0.10.0.ebuild
+++ b/dev-ruby/rb-inotify/rb-inotify-0.10.0.ebuild
@@ -22,6 +22,8 @@ IUSE=""
 
 ruby_add_rdepend "dev-ruby/ffi"
 
+ruby_add_bdepend "test? ( dev-ruby/concurrent-ruby )"
+
 all_ruby_prepare() {
 	# Avoid unneeded dependency on jeweler.
 	sed -i -e '/:build/ s:^:#:' -e '/module Jeweler/,/^end/ s:^:#:' -e '/class Jeweler/,/^end/ s:^:#:' Rakefile || die