diff --git a/dev-ruby/hiera/hiera-3.1.0.ebuild b/dev-ruby/hiera/hiera-3.1.0.ebuild
index 04e63fb7b0c7f..2cc9248da6171 100644
--- a/dev-ruby/hiera/hiera-3.1.0.ebuild
+++ b/dev-ruby/hiera/hiera-3.1.0.ebuild
@@ -23,7 +23,8 @@ KEYWORDS="~amd64 ~hppa ~x86"
 
 ruby_add_bdepend "test? ( dev-ruby/mocha )"
 
-ruby_add_rdepend "dev-ruby/json"
+ruby_add_rdepend "dev-ruby/json
+	dev-ruby/deep_merge"
 
 all_ruby_prepare() {
 	# Our json package is either the compiled version or the pure