diff --git a/ncgen/ncgen.h b/ncgen/ncgen.h
index 9dcffc4d2..19670255c 100644
--- a/ncgen/ncgen.h
+++ b/ncgen/ncgen.h
@@ -102,7 +102,7 @@ typedef struct Diminfo {
     int   isconstant; /* separate constant from named dimension*/
     size_t  unlimitedsize; /* if unlimited */
     size_t  declsize; /* 0 => unlimited/unspecified*/
-//    size_t  unlimitedsize; /* computed unlimited size  */
+/*    size_t  unlimitedsize; *//* computed unlimited size  */
 } Diminfo;
 
 typedef struct Attrinfo {