diff --git a/lib/mrsk/utils.rb b/lib/mrsk/utils.rb
index 249e2ded..b7515c5b 100644
--- a/lib/mrsk/utils.rb
+++ b/lib/mrsk/utils.rb
@@ -25,11 +25,10 @@ module Mrsk::Utils
 
   # Returns a list of shell-dashed option arguments. If the value is true, it's treated like a value-less option.
   def optionize(args, with: nil)
-    flattened_args = flatten_args args
     options = if with
-      flattened_args.collect { |(key, value)| value == true ? "--#{key}" : "--#{key}#{with}#{escape_shell_value(value)}" }
+      flatten_args(args).collect { |(key, value)| value == true ? "--#{key}" : "--#{key}#{with}#{escape_shell_value(value)}" }
     else
-      flattened_args.collect { |(key, value)| [ "--#{key}", value == true ? nil : escape_shell_value(value) ] }
+      flatten_args(args).collect { |(key, value)| [ "--#{key}", value == true ? nil : escape_shell_value(value) ] }
     end
 
     options.flatten.compact
@@ -37,7 +36,7 @@ module Mrsk::Utils
 
   # Flattens a one-to-many structure into an array of two-element arrays each containing a key-value pair
   def flatten_args(args)
-    args.flat_map { |key, value| value.respond_to?('map') ? value.map { |entry| [key, entry] }: [[key, value]] }
+    args.flat_map { |key, value| value.try(:map) { |entry| [key, entry] } || [ [ key, value ] ] }
   end
 
   # Copied from SSHKit::Backend::Abstract#redact to be available inside Commands classes