diff --git a/common.mk b/common.mk
index 2eddfa53f6..ea3443a5ac 100644
--- a/common.mk
+++ b/common.mk
@@ -1149,7 +1149,9 @@ update-bundled_gems: PHONY
 	$(Q) $(RUNRUBY) -rrubygems \
 	    -pla \
 	    -e '$$_=Gem::SpecFetcher.fetcher.detect(:latest) {|s|' \
-	    -e   'break "#{s.name} #{s.version}" if s.platform=="ruby"&&s.name==$$F[0]' \
+	    -e   'if s.platform=="ruby"&&s.name==$$F[0]' \
+	    -e     'break [s.name, s.version, *$$F[2..-1]].join(" ")' \
+	    -e   'end' \
 	    -e '}' \
 	     "$(srcdir)/gems/bundled_gems" | \
 	"$(IFCHANGE)" "$(srcdir)/gems/bundled_gems" -