diff --git a/contrib/completions/bash/oc b/contrib/completions/bash/oc
index b814182b8e..d908f8c544 100644
--- a/contrib/completions/bash/oc
+++ b/contrib/completions/bash/oc
@@ -706,10 +706,6 @@ _oc_adm_catalog_mirror()
     local_nonpersistent_flags+=("--dir=")
     flags+=("--dry-run")
     local_nonpersistent_flags+=("--dry-run")
-    flags+=("--filter-by-os=")
-    two_word_flags+=("--filter-by-os")
-    local_nonpersistent_flags+=("--filter-by-os")
-    local_nonpersistent_flags+=("--filter-by-os=")
     flags+=("--from-dir=")
     two_word_flags+=("--from-dir")
     local_nonpersistent_flags+=("--from-dir")
diff --git a/contrib/completions/zsh/oc b/contrib/completions/zsh/oc
index 976e3d5b49..9a047858f7 100644
--- a/contrib/completions/zsh/oc
+++ b/contrib/completions/zsh/oc
@@ -806,10 +806,6 @@ _oc_adm_catalog_mirror()
     local_nonpersistent_flags+=("--dir=")
     flags+=("--dry-run")
     local_nonpersistent_flags+=("--dry-run")
-    flags+=("--filter-by-os=")
-    two_word_flags+=("--filter-by-os")
-    local_nonpersistent_flags+=("--filter-by-os")
-    local_nonpersistent_flags+=("--filter-by-os=")
     flags+=("--from-dir=")
     two_word_flags+=("--from-dir")
     local_nonpersistent_flags+=("--from-dir")
diff --git a/pkg/cli/admin/catalog/mirror.go b/pkg/cli/admin/catalog/mirror.go
index 9142feb838..bdf68290e6 100644
--- a/pkg/cli/admin/catalog/mirror.go
+++ b/pkg/cli/admin/catalog/mirror.go
@@ -7,7 +7,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"regexp"
 	"strings"
 	"text/tabwriter"
 	"time"
@@ -135,6 +134,7 @@ func NewMirrorCatalog(f kcmdutil.Factory, streams genericclioptions.IOStreams) *
 	// the old flag name is kept for backwards-compatibility.
 	// if both old and new are specified, the value of the flag coming later will be used.
 	flags.StringVar(&o.FilterOptions.FilterByOS, "filter-by-os", o.FilterOptions.FilterByOS, "Use --index-filter-by-os instead. A regular expression to control which index image is picked when multiple variants are available. Images will be passed as '<platform>/<architecture>[/<variant>]'. This does not apply to images referenced by the index.")
+	_ = flags.MarkDeprecated("filter-by-os", "use --index-filter-by-os instead")
 
 	flags.StringVar(&o.ManifestDir, "to-manifests", "", "Local path to store manifests.")
 	flags.StringVar(&o.DatabasePath, "path", "", "Specify an in-container to local path mapping for the database.")
@@ -154,10 +154,10 @@ func (o *MirrorCatalogOptions) Complete(cmd *cobra.Command, args []string) error
 	src := args[0]
 	dest := args[1]
 
-	// default to linux/arm64 for index image, which we generally expect to exist
+	// default to linux/amd64 for index image, which we generally expect to exist
 	pattern := o.FilterOptions.FilterByOS
 	if len(pattern) == 0 {
-		o.FilterOptions.FilterByOS = regexp.QuoteMeta(fmt.Sprintf("%s/%s", "linux", "amd64"))
+		o.FilterOptions.FilterByOS = "linux/amd64"
 	}
 	if err := o.FilterOptions.Validate(); err != nil {
 		return err