diff --git a/code/awk/mkunion.awk b/code/awk/mkunion.awk
index 7dd7117..69e94cd 100755
--- a/code/awk/mkunion.awk
+++ b/code/awk/mkunion.awk
@@ -3,7 +3,7 @@
 # create the sdl object: an union of sphere
 BEGIN	{
 	nbre = 0
-        print "#declare Bubules = object"
+        print "#declare Bubulles = object"
 	print "{ \nunion  { "
 	}