diff --git a/macros/PG.pl b/macros/PG.pl
index 9baff67f0c..502000992c 100644
--- a/macros/PG.pl
+++ b/macros/PG.pl
@@ -13,7 +13,7 @@ sub _PG_init{
   #  Set up MathObject context for use in problems
   #  that don't load MathObjects.pl
   #
-  %main::context = {};
+  %main::context = ();
   Parser::Context->current(\%main::context);
 
 }