diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index a577fd7e4825..99513e71e3ff 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -501,7 +501,7 @@ bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg)
  * otherwise, return the required width.
  */
 int
-pr_u64(struct buf_pr *b, uint64_t *pd, int width)
+pr_u64(struct buf_pr *b, void *pd, int width)
 {
 #ifdef TCC
 #define U64_FMT "I64"
diff --git a/sbin/ipfw/ipfw2.h b/sbin/ipfw/ipfw2.h
index 106d74cb15b4..764e5176e8ef 100644
--- a/sbin/ipfw/ipfw2.h
+++ b/sbin/ipfw/ipfw2.h
@@ -328,7 +328,7 @@ struct buf_pr {
 	size_t	needed;	/* length needed */
 };
 
-int pr_u64(struct buf_pr *bp, uint64_t *pd, int width);
+int pr_u64(struct buf_pr *bp, void *pd, int width);
 int bp_alloc(struct buf_pr *b, size_t size);
 void bp_free(struct buf_pr *b);
 int bprintf(struct buf_pr *b, const char *format, ...);