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-rw-r--r--lib/puppet/parser/parser_support.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/puppet/parser/parser_support.rb b/lib/puppet/parser/parser_support.rb
index bc3444c2a..4e47cdef4 100644
--- a/lib/puppet/parser/parser_support.rb
+++ b/lib/puppet/parser/parser_support.rb
@@ -4,6 +4,7 @@ class Puppet::Parser::Parser
require 'puppet/parser/functions'
require 'puppet/parser/files'
require 'puppet/parser/loaded_code'
+ require 'monitor'
AST = Puppet::Parser::AST