diff --git a/mpbackup b/mpbackup
index e279e65..b462bf9 100644
--- a/mpbackup
+++ b/mpbackup
@@ -137,7 +137,11 @@ config_names = options[:config_names]
 if config_names.empty?
   puts "No configuration name has been given. Will use the first "\
     "configuration from the file (‘#{configs.dig(0, 'name')}’)."
-  backup configs[0]
+  if options[:prune]
+    prune configs[0]
+  else
+    backup configs[0]
+  end
 else
   config_hash = configs.map {|c| [c['name'], c]}.to_h
   config_names.each do |name|