diff --git a/tools/confix/cmd/migrate.go b/tools/confix/cmd/migrate.go
index c2613533e955..7e6c01e03401 100644
--- a/tools/confix/cmd/migrate.go
+++ b/tools/confix/cmd/migrate.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"maps"
 	"path/filepath"
+	"slices"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -60,7 +61,7 @@ In case of any error in updating the file, no output is written.`,
 			targetVersion := args[0]
 			plan, ok := confix.Migrations[targetVersion]
 			if !ok {
-				return fmt.Errorf("unknown version %q, supported versions are: %q", targetVersion, maps.Keys(confix.Migrations))
+				return fmt.Errorf("unknown version %q, supported versions are: %q", targetVersion, slices.Collect(maps.Keys(confix.Migrations)))
 			}
 
 			rawFile, err := confix.LoadConfig(configPath)