diff --git a/lib/puppet/functions/regsubst.rb b/lib/puppet/functions/regsubst.rb
index c1fa0a8b2ee..cd8ca535dd5 100644
--- a/lib/puppet/functions/regsubst.rb
+++ b/lib/puppet/functions/regsubst.rb
@@ -104,7 +104,7 @@ def inner_regsubst(target, re, replacement, op)
     elsif target.respond_to?(:unwrap)
       # this is a Sensitive
       target = target.unwrap
-      target = target.respond_to?(op) ? target.send(op, re, replacement) : target.collect { |e| e.send(op, re, replacement) }
+      target = target.respond_to?(op) ? target.send(op, re, replacement) : target.map { |e| e.send(op, re, replacement) }
       Puppet::Pops::Types::PSensitiveType::Sensitive.new(target)
     else
       # this should be a String