--- pic2plot/gram.yy.str	2009-03-28 22:28:01.000000000 +0100
+++ pic2plot/gram.yy	2009-03-28 22:28:15.000000000 +0100
@@ -1833,7 +1833,7 @@
 	    {
 	      one_format += *form++;
 	      one_format += '\0';
-	      sprintf(sprintf_buf, one_format.contents());
+	      sprintf(sprintf_buf, "%s", one_format.contents());
 	    }
 	  else 
 	    {