diff --git a/debian/patches/24_check_disk_fix_SI_units b/debian/patches/24_check_disk_fix_SI_units
new file mode 100644
index 0000000..7e5efb2
--- /dev/null
+++ b/debian/patches/24_check_disk_fix_SI_units
@@ -0,0 +1,56 @@
+From bf8eb6dcc7f9d1318ddeac16fe62a5b5f818524b Mon Sep 17 00:00:00 2001
+From: RincewindsHat <12514511+RincewindsHat@users.noreply.github.com>
+Date: Fri, 26 May 2023 08:43:24 +0200
+Subject: [PATCH] check_disk: Display SI units correctly
+
+---
+ plugins/check_disk.c | 27 +++++++++++++++++++++------
+ 1 file changed, 21 insertions(+), 6 deletions(-)
+
+diff --git a/plugins/check_disk.c b/plugins/check_disk.c
+index a99f35e33..39dc6cd21 100644
+--- a/plugins/check_disk.c
++++ b/plugins/check_disk.c
+@@ -626,21 +626,36 @@ process_arguments (int argc, char **argv)
+       if (! strcasecmp (optarg, "bytes")) {
+         mult = (uintmax_t)1;
+         units = strdup ("B");
+-      } else if ( (! strcmp (optarg, "kB")) || (!strcmp(optarg, "KiB")) ) {
++      } else if (!strcmp(optarg, "KiB")) {
+         mult = (uintmax_t)1024;
+-        units = strdup ("kiB");
+-      } else if ( (! strcmp (optarg, "MB")) || (!strcmp(optarg, "MiB")) )  {
++        units = strdup ("KiB");
++      } else if (! strcmp (optarg, "kB")) {
++        mult = (uintmax_t)1000;
++        units = strdup ("kB");
++      } else if (!strcmp(optarg, "MiB")) {
+         mult = (uintmax_t)1024 * 1024;
+         units = strdup ("MiB");
+-      } else if ( (! strcmp (optarg, "GB")) || (!strcmp(optarg, "GiB")) ) {
++      } else if (! strcmp (optarg, "MB")) {
++        mult = (uintmax_t)1000 * 1000;
++        units = strdup ("MB");
++      } else if (!strcmp(optarg, "GiB")) {
+         mult = (uintmax_t)1024 * 1024 * 1024;
+         units = strdup ("GiB");
+-      } else if ( (! strcmp (optarg, "TB")) || (!strcmp(optarg, "TiB")) ) {
++      } else if (! strcmp (optarg, "GB")){
++        mult = (uintmax_t)1000 * 1000 * 1000;
++        units = strdup ("GB");
++      } else if (!strcmp(optarg, "TiB")) {
+         mult = (uintmax_t)1024 * 1024 * 1024 * 1024;
+         units = strdup ("TiB");
+-      } else if ( (! strcmp (optarg, "PB")) || (!strcmp(optarg, "PiB")) ) {
++      } else if (! strcmp (optarg, "TB")) {
++        mult = (uintmax_t)1000 * 1000 * 1000 * 1000;
++        units = strdup ("TB");
++      } else if (!strcmp(optarg, "PiB")) {
+         mult = (uintmax_t)1024 * 1024 * 1024 * 1024 * 1024;
+         units = strdup ("PiB");
++      } else if (! strcmp (optarg, "PB")){
++        mult = (uintmax_t)1000 * 1000 * 1000 * 1000 * 1000;
++        units = strdup ("PB");
+       } else {
+         die (STATE_UNKNOWN, _("unit type %s not known\n"), optarg);
+       }
diff --git a/debian/patches/series b/debian/patches/series
index 062b069..7fde2dc 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -15,6 +15,7 @@
 21_check_pgsql_extra_output
 22_check_disk_avoid_mount
 23_check_mysql_fix_error_handling
+24_check_disk_fix_SI_units
 # feature patches
 30_check_radius_radcli_1.3.1_support
 31_checl_mailq_separate_submission_queue