--- ../lisp/progmodes/cc-cmds.el	2001-07-16 02:46:48.000000000 -0400
+++ cc-cmds.el	2003-05-16 11:31:30.000000000 -0400
@@ -2425,7 +2425,8 @@
 	    ;; we're on the first line in a block comment so it'll be
 	    ;; wrong.  Ignore it to guess a better one below.
 	    (setq fill-prefix nil)
-	  (when (and (eq c-lit-type 'c++)
+	  (when (and (or (eq c-lit-type 'c++)
+                         (eq c-lit-type 'c))
 		     (not (string-match "\\`[ \t]*//" (or fill-prefix ""))))
 	    ;; Kludge: If the function that adapted the fill prefix
 	    ;; doesn't produce the required comment starter for line