diff --git a/src/PVE/QemuMigrate.pm b/src/PVE/QemuMigrate.pm
index 8da6f15..a9b6989 100644
--- a/src/PVE/QemuMigrate.pm
+++ b/src/PVE/QemuMigrate.pm
@@ -412,15 +412,15 @@ sub scan_local_volumes {
             }
 
             my $snaprefs = $attr->{referenced_in_snapshot};
+            my $snapshot_hint = '';
+            if (defined($snaprefs) && !$attr->{is_attached}) {
+                my $snapnames = join(', ', sort keys %$snaprefs);
+                $snapshot_hint = " (referenced in snapshot - $snapnames)";
+            }
 
             if ($attr->{cdrom}) {
                 if ($volid eq 'cdrom') {
-                    my $msg = "can't migrate local cdrom drive";
-                    if (defined($snaprefs) && !$attr->{is_attached}) {
-                        my $snapnames = join(', ', sort keys %$snaprefs);
-                        $msg .= " (referenced in snapshot - $snapnames)";
-                    }
-                    &$log_error("$msg\n");
+                    &$log_error("can't migrate local cdrom drive$snapshot_hint\n");
                     return;
                 }
                 return if $volid eq 'none';
@@ -475,7 +475,7 @@ sub scan_local_volumes {
                     $local_volumes->{$volid}->{ref} = 'generated';
                     return;
                 }
-                die "local cdrom image\n";
+                die "local cdrom image$snapshot_hint\n";
             }
 
             my ($path, $owner) = PVE::Storage::path($storecfg, $volid);
diff --git a/src/test/run_qemu_migrate_tests.pl b/src/test/run_qemu_migrate_tests.pl
index 05eed1d..49248ed 100644
--- a/src/test/run_qemu_migrate_tests.pl
+++ b/src/test/run_qemu_migrate_tests.pl
@@ -37,6 +37,7 @@ my $storage_config = {
         local => {
             content => {
                 images => 1,
+                iso => 1,
             },
             path => "/var/lib/vz",
             type => "dir",
@@ -346,6 +347,17 @@ my $source_vdisks = {
             'volid' => 'local-dir:4567/vm-4567-state-snap2.raw',
         },
     ],
+    'local' => [
+        {
+            'ctime' => 1589439681,
+            'format' => 'iso',
+            'parent' => undef,
+            'size' => 663748608,
+            'used' => 663748608,
+            'vmid' => '0',
+            'volid' => 'local:iso/debian.iso',
+        },
+    ],
     'local-lvm' => [
         {
             'ctime' => '1589277334',
@@ -1236,6 +1248,41 @@ my $tests = [
             },
         },
     },
+    {
+        name => '105_local_iso_in_snapshot',
+        target => 'pve1',
+        vmid => 105,
+        vm_status => {
+            running => 0,
+        },
+        config_patch => {
+            snapshots => {
+                ohsnap => {
+                    ide2 => 'local:iso/debian.iso,media=cdrom',
+                },
+            },
+        },
+        expected_calls => {},
+        expect_die =>
+            "can't migrate local disk 'local:iso/debian.iso': local cdrom image (referenced in snapshot - ohsnap)",
+        expected => {
+            source_volids => local_volids_for_vm(105),
+            target_volids => {},
+            vm_config => get_patched_config(
+                105,
+                {
+                    snapshots => {
+                        ohsnap => {
+                            ide2 => 'local:iso/debian.iso,media=cdrom',
+                        },
+                    },
+                },
+            ),
+            vm_status => {
+                running => 0,
+            },
+        },
+    },
     {
         name => '105_cdrom',
         target => 'pve1',