1 files changed, 1 insertions, 2 deletions
diff --git a/lib/puppet/parser/ast/function.rb b/lib/puppet/parser/ast/function.rb
index 602016c75..80e6e6512 100644
--- a/lib/puppet/parser/ast/function.rb
+++ b/lib/puppet/parser/ast/function.rb
@@ -11,7 +11,6 @@ class Puppet::Parser::AST
     @settor = true
 
     def evaluate(scope)
-
       # Make sure it's a defined function
       raise Puppet::ParseError, "Unknown function #{@name}" unless Puppet::Parser::Functions.function(@name)
 
@@ -29,7 +28,7 @@ class Puppet::Parser::AST
       end
 
       # We don't need to evaluate the name, because it's plaintext
-      args = @arguments.safeevaluate(scope)
+      args = @arguments.safeevaluate(scope).map { |x| x == :undef ? '' : x }
 
       scope.send("function_#{@name}", args)
     end