diff --git a/lib/packaging/util/file.rb b/lib/packaging/util/file.rb
index 2e8d09e..9e7d799 100644
--- a/lib/packaging/util/file.rb
+++ b/lib/packaging/util/file.rb
@@ -59,7 +59,7 @@ def file_writable?(file, args = { :required => false })
 
     def erb_string(erbfile, b = binding)
       template = File.read(erbfile)
-      message  = ERB.new(template, nil, "-")
+      message  = ERB.new(template, trim_mode: '-')
       message.result(b)
     end