diff --git a/tools/js2c.py b/tools/js2c.py
index 35bf43b..2da132f 100755
--- a/tools/js2c.py
+++ b/tools/js2c.py
@@ -275,8 +275,8 @@
   debugger_ids = []
   modules = []
   # Locate the macros file name.
-  consts = {}
-  macros = {}
+  consts = []
+  macros = []
   for s in source:
     if 'macros.py' == (os.path.split(str(s))[1]):
       (consts, macros) = ReadMacros(ReadLines(str(s)))