Index: tools/autogen.py
===================================================================
--- tools/autogen.py	(revision 57292d30b3826ea0794eb52897209d68bd98d76b)
+++ tools/autogen.py	(revision 4236b18ef8b01c2658d23f54ca802874c8232232)
@@ -128,5 +128,5 @@
 
 def filter_pairs(lines):
-	pattern = re.compile("^\tEMITTED_CONSTANT ([A-Z_]*) = \$([0-9]*)$");
+	pattern = re.compile("^\tEMITTED_CONSTANT ([A-Z_][A-Z0-9_]*) = \$([0-9]+)$");
 	pairs = []
 	for line in lines: