diff --git a/eclass/ruby-ng.eclass b/eclass/ruby-ng.eclass
index 6eceb4d5ba9fc..d6b3d2a0669a9 100644
--- a/eclass/ruby-ng.eclass
+++ b/eclass/ruby-ng.eclass
@@ -630,7 +630,7 @@ doruby() {
 	[[ -z ${RUBY} ]] && die "\$RUBY is not set"
 	( # don't want to pollute calling env
 		sitelibdir=$(ruby_rbconfig_value 'sitelibdir')
-		insinto ${sitelibdir#${EPREFIX}}
+		insinto "${sitelibdir#${EPREFIX}}"
 		insopts -m 0644
 		doins "$@"
 	) || die "failed to install $@"