diff --git a/src/PVE/API2/Disks/ZFS.pm b/src/PVE/API2/Disks/ZFS.pm
index b26805a..2215dd6 100644
--- a/src/PVE/API2/Disks/ZFS.pm
+++ b/src/PVE/API2/Disks/ZFS.pm
@@ -245,7 +245,7 @@ __PACKAGE__->register_method({
                     $config = 1;
                 } elsif (
                     $config
-                    && $line =~ m/^(\s+)(\S+)\s*(\S+)?(?:\s+(\S+)\s+(\S+)\s+(\S+))?\s*(.*)$/
+                    && $line =~ m/^(\s+)(\S+)\s*(\S+)?(?:\s+(\d+)\s+(\d+)\s+(\d+))?\s*(.*)$/
                 ) {
                     my ($space, $name, $state, $read, $write, $cksum, $msg) =
                         ($1, $2, $3, $4, $5, $6, $7);
diff --git a/src/test/zfs_pool_detail_test.pm b/src/test/zfs_pool_detail_test.pm
index 00d666a..bcca5ae 100644
--- a/src/test/zfs_pool_detail_test.pm
+++ b/src/test/zfs_pool_detail_test.pm
@@ -225,6 +225,109 @@ EOF
             ],
         },
     },
+    {
+        description => 'hot spare in use',
+        status => <<"EOF",
+  pool: tank
+ state: ONLINE
+  scan: resilvered 725M in 00:00:00 with 0 errors on Mon May 12 16:50:25 2025
+config:
+
+\tNAME                                    STATE     READ WRITE CKSUM
+\ttank                                    ONLINE       0     0     0
+\t  mirror-0                              ONLINE       0     0     0
+\t    spare-0                             ONLINE       0     0     0
+\t      /dev/disk/by-id/ata-DISK_A-part1  ONLINE       0     0     0
+\t      /dev/disk/by-id/ata-DISK_C-part1  ONLINE       0     0     0
+\t    /dev/disk/by-id/ata-DISK_B-part1    ONLINE       0     0     0
+\tspares
+\t  /dev/disk/by-id/ata-DISK_C-part1      INUSE     currently in use
+
+errors: No known data errors
+EOF
+        expected => {
+            name => 'tank',
+            state => 'ONLINE',
+            scan => 'resilvered 725M in 00:00:00 with 0 errors on Mon May 12 16:50:25 2025',
+            errors => 'No known data errors',
+            leaf => 0,
+            children => [
+                {
+                    name => 'tank',
+                    state => 'ONLINE',
+                    read => 0,
+                    write => 0,
+                    cksum => 0,
+                    msg => '',
+                    leaf => 0,
+                    children => [
+                        {
+                            name => 'mirror-0',
+                            state => 'ONLINE',
+                            read => 0,
+                            write => 0,
+                            cksum => 0,
+                            msg => '',
+                            leaf => 0,
+                            children => [
+                                {
+                                    name => 'spare-0',
+                                    state => 'ONLINE',
+                                    read => 0,
+                                    write => 0,
+                                    cksum => 0,
+                                    msg => '',
+                                    leaf => 0,
+                                    children => [
+                                        {
+                                            name => '/dev/disk/by-id/ata-DISK_A-part1',
+                                            state => 'ONLINE',
+                                            read => 0,
+                                            write => 0,
+                                            cksum => 0,
+                                            msg => '',
+                                            leaf => 1,
+                                        },
+                                        {
+                                            name => '/dev/disk/by-id/ata-DISK_C-part1',
+                                            state => 'ONLINE',
+                                            read => 0,
+                                            write => 0,
+                                            cksum => 0,
+                                            msg => '',
+                                            leaf => 1,
+                                        },
+                                    ],
+                                },
+                                {
+                                    name => '/dev/disk/by-id/ata-DISK_B-part1',
+                                    state => 'ONLINE',
+                                    read => 0,
+                                    write => 0,
+                                    cksum => 0,
+                                    msg => '',
+                                    leaf => 1,
+                                },
+                            ],
+                        },
+                    ],
+                },
+                {
+                    name => 'spares',
+                    msg => '',
+                    leaf => 0,
+                    children => [
+                        {
+                            name => '/dev/disk/by-id/ata-DISK_C-part1',
+                            state => 'INUSE',
+                            msg => 'currently in use',
+                            leaf => 1,
+                        },
+                    ],
+                },
+            ],
+        },
+    },
 ];
 
 plan tests => scalar @$tests;