diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index fcc41f2151..b1f657a69b 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -874,7 +874,7 @@ end
 def load_gemspec(file, expanded = false)
   file = File.realpath(file)
   code = File.read(file, encoding: "utf-8:-")
-  code.gsub!(/(?:`git[^\`]*`|%x\[git[^\]]*\])\.split\(\"(?:\\.|[^\"])*\"\)/m) do
+  code.gsub!(/(?:`git[^\`]*`|%x\[git[^\]]*\])\.split\([^\)]*\)/m) do
     files = []
     if expanded
       base = File.dirname(file)