1 files changed, 7 insertions, 3 deletions
diff --git a/lib/puppet/parser/functions/concat.rb b/lib/puppet/parser/functions/concat.rb
index c86aa00..6c86382 100644
--- a/lib/puppet/parser/functions/concat.rb
+++ b/lib/puppet/parser/functions/concat.rb
@@ -23,12 +23,16 @@ Would result in:
     a = arguments[0]
     b = arguments[1]
 
-    # Check that both args are arrays.
-    unless a.is_a?(Array) and b.is_a?(Array)
+    # Check that the first parameter is an array
+    unless a.is_a?(Array)
       raise(Puppet::ParseError, 'concat(): Requires array to work with')
     end
 
-    result = a.concat(b)
+    if b.is_a?(Array)
+      result = a.concat(b)
+    else
+      result = a << b
+    end
 
     return result
   end