diff --git a/bfg.h b/bfg.h
index c3a33e9..ab2f5e4 100644
--- a/bfg.h
+++ b/bfg.h
@@ -41,7 +41,7 @@ typedef struct {
   char *crs;                    /* internal representation of charset */
   char *ptr;                    /* ptr to the last generated password */
   uint32_t disable_symbols;
-  unsigned long rain;			//accumulator for the rain//
+  uint64_t rain;	 		          /* accumulator for the rain */
 } bf_option;
 
 extern bf_option bf_options;