diff --git a/sysutils/zpool-iostat-viz/Makefile b/sysutils/zpool-iostat-viz/Makefile
index f8c4a71ab7b8..ec63f247aa55 100644
--- a/sysutils/zpool-iostat-viz/Makefile
+++ b/sysutils/zpool-iostat-viz/Makefile
@@ -1,25 +1,26 @@
 PORTNAME=	zpool-iostat-viz
 DISTVERSION=	3
+PORTREVISION=	1
 CATEGORIES=	sysutils
 
 MAINTAINER=	se@FreeBSD.org
 COMMENT=	ZFS pool I/O latency statistics
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		python:3.4+ shebangfix
 USE_GITHUB=	yes
 GH_ACCOUNT=	chadmiller
 SHEBANG_FILES=	${WRKSRC}/${PORTNAME}
 
 NO_ARCH=	yes
 NO_BUILD=	yes
 
 PLIST_FILES=	bin/${PORTNAME} man/man1/${PORTNAME}.1.gz
 
 do-install:
 		${INSTALL_SCRIPT} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
 		${INSTALL_MAN} ${FILESDIR}/${PORTNAME}.1 ${STAGEDIR}${MANPREFIX}/man/man1
 
 .include <bsd.port.mk>
diff --git a/sysutils/zpool-iostat-viz/files/patch-zpool-iostat-viz b/sysutils/zpool-iostat-viz/files/patch-zpool-iostat-viz
index 6f8ea84cea21..6b025cdf7bf9 100644
--- a/sysutils/zpool-iostat-viz/files/patch-zpool-iostat-viz
+++ b/sysutils/zpool-iostat-viz/files/patch-zpool-iostat-viz
@@ -1,51 +1,60 @@
---- zpool-iostat-viz.orig	2021-11-06 15:43:57 UTC
+--- zpool-iostat-viz.orig	2021-11-13 22:58:47 UTC
 +++ zpool-iostat-viz
 @@ -19,7 +19,10 @@ import sys
  EMPTY_COLORS = (238, 8)
  EMPTY_CHAR = "|"
  PALETTES = list(range(start, end+(second-start), second-start) for second, start, end in ((63, 27, 207), (87, 51, 231), (116, 123, 88), (220, 226, 196), (224, 231, 196), (80, 51, 196), (77, 40, 225), (225, 231, 201), (243, 240, 255), (227, 226, 231), (27, 21, 51)))
 -DISPLAY_CHARS = ".abcdefghijklmnopqrstuvwxyz^"
 +DISPLAY_CHARS_LETTERS = ".abcdefghijklmnopqrstuvwxyz^"
 +DISPLAY_CHARS_DIGITS = ".0123456789#"
 +DISPLAY_CHARS_SYMBOLS = " .:;*#"
 +DISPLAY_CHARS = DISPLAY_CHARS_LETTERS
  DIFFL_CLOCK_CHARS = "╷╴╵╶"
  
  DIFFL_STAT_MEMORY = 5
-@@ -219,6 +222,15 @@ def render_stats(window, transform, should_show_differ
+@@ -219,10 +222,22 @@ def render_stats(window, transform, should_show_differ
          elif in_key == curses.KEY_DOWN:
              if diffl_stat_interval_index > 0:
                  diffl_stat_interval_index -= 1
 +        elif in_key == ord('d'):
 +            should_show_differential = not should_show_differential
 +        elif in_key == ord('m'):
++            load_time = None
 +            current = 0
++            stats = None
 +            stats_history = []
 +            if transform == stats_as_device_centric:
 +                transform = stats_as_measurement_centric
 +            else:
 +                transform = stats_as_device_centric
          elif in_key == ord('q') or in_key == ord('x') or in_key == 27:
              return
-         current += len(stats)
-@@ -256,6 +266,8 @@ if __name__ == "__main__":
+-        current += len(stats)
+-        current %= len(stats)
++        if stats:
++            current += len(stats)
++            current %= len(stats)
+ 
+ 
+ def main(window, should_show_differential, pool, filename, views):
+@@ -256,6 +271,8 @@ if __name__ == "__main__":
          arg_parser.add_argument("--pal-count", "--pc", action="store", metavar="P", default="0", help="palette for bucket populations")
          arg_parser.add_argument("parts", metavar="pool/vdev", nargs="*", help="Pools or vdevs to display")
          arg_parser.add_argument("--help-colors", action="store_true", help="see color palettes available")
 +        arg_parser.add_argument("--digits", action="store_true", help="use digits instead of letters")
 +        arg_parser.add_argument("--symbols", action="store_true", help="use digits instead of letters")
  
          parsed_args = vars(arg_parser.parse_args())
  
-@@ -276,6 +288,11 @@ if __name__ == "__main__":
+@@ -275,6 +292,11 @@ if __name__ == "__main__":
+                 if hex(pi)[2:] == parsed_args["pal_time"]: print("  (time)", end="")
                  print()
              sys.exit(0)
- 
++
 +        if parsed_args["digits"]:
 +            DISPLAY_CHARS = DISPLAY_CHARS_DIGITS
 +        if parsed_args["symbols"]:
 +            DISPLAY_CHARS = DISPLAY_CHARS_SYMBOLS
-+
+ 
          curses.wrapper(lambda window: main(window, parsed_args["diff"], parsed_args["parts"], parsed_args["file"], parsed_args["by"] or "m"))
      except subprocess.CalledProcessError as exc:
-         print("I couldn't get your pool information. Make sure you have 'zpool' program and specify your pool correctly.")