--- a/mojoshader.c	Sat May 10 16:13:29 2008 -0400
+++ b/mojoshader.c	Sat May 10 21:50:21 2008 -0400
@@ -2330,6 +2330,7 @@
 
             else if (usage == MOJOSHADER_USAGE_COLOR)
             {
+                index_str[0] = '\0';  // no explicit number.
                 if (index == 0)
                     usage_str = "gl_Color";
                 else if (index == 1)