diff --git a/fs/config.go b/fs/config.go
index 2f01046ce..2f4902cfb 100644
--- a/fs/config.go
+++ b/fs/config.go
@@ -85,7 +85,6 @@ var (
 	lowLevelRetries = pflag.IntP("low-level-retries", "", 10, "Number of low level retries to do.")
 	updateOlder     = pflag.BoolP("update", "u", false, "Skip files that are newer on the destination.")
 	noGzip          = pflag.BoolP("no-gzip-encoding", "", false, "Don't set Accept-Encoding: gzip.")
-	dedupeMode      = pflag.StringP("dedupe-mode", "", "interactive", "Dedupe mode interactive|skip|first|newest|oldest|rename.")
 	maxDepth        = pflag.IntP("max-depth", "", -1, "If set limits the recursion depth to this.")
 	ignoreSize      = pflag.BoolP("ignore-size", "", false, "Ignore size when skipping use mod-time or checksum.")
 	noTraverse      = pflag.BoolP("no-traverse", "", false, "Don't traverse destination file system on copy.")
@@ -237,7 +236,6 @@ type ConfigInfo struct {
 	LowLevelRetries    int
 	UpdateOlder        bool // Skip files that are newer on the destination
 	NoGzip             bool // Disable compression
-	DedupeMode         DeduplicateMode
 	MaxDepth           int
 	IgnoreSize         bool
 	NoTraverse         bool
@@ -355,23 +353,6 @@ func LoadConfig() {
 	Config.DeleteDuring = *deleteDuring
 	Config.DeleteAfter = *deleteAfter
 
-	switch strings.ToLower(*dedupeMode) {
-	case "interactive":
-		Config.DedupeMode = DeduplicateInteractive
-	case "skip":
-		Config.DedupeMode = DeduplicateSkip
-	case "first":
-		Config.DedupeMode = DeduplicateFirst
-	case "newest":
-		Config.DedupeMode = DeduplicateNewest
-	case "oldest":
-		Config.DedupeMode = DeduplicateOldest
-	case "rename":
-		Config.DedupeMode = DeduplicateRename
-	default:
-		log.Fatalf(`Unknown mode for --dedupe-mode %q.`, *dedupeMode)
-	}
-
 	switch {
 	case *deleteBefore && (*deleteDuring || *deleteAfter),
 		*deleteDuring && *deleteAfter:
diff --git a/fs/operations.go b/fs/operations.go
index 48c149982..5740ac37d 100644
--- a/fs/operations.go
+++ b/fs/operations.go
@@ -14,6 +14,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/ogier/pflag"
 	"github.com/pkg/errors"
 
 	"golang.org/x/text/unicode/norm"
@@ -871,8 +872,8 @@ const (
 	DeduplicateRename                             // rename the objects
 )
 
-func (mode DeduplicateMode) String() string {
-	switch mode {
+func (x DeduplicateMode) String() string {
+	switch x {
 	case DeduplicateInteractive:
 		return "interactive"
 	case DeduplicateSkip:
@@ -889,6 +890,35 @@ func (mode DeduplicateMode) String() string {
 	return "unknown"
 }
 
+// Set a DeduplicateMode from a string
+func (x *DeduplicateMode) Set(s string) error {
+	switch strings.ToLower(s) {
+	case "interactive":
+		*x = DeduplicateInteractive
+	case "skip":
+		*x = DeduplicateSkip
+	case "first":
+		*x = DeduplicateFirst
+	case "newest":
+		*x = DeduplicateNewest
+	case "oldest":
+		*x = DeduplicateOldest
+	case "rename":
+		*x = DeduplicateRename
+	default:
+		return errors.Errorf("Unknown mode for dedupe %q.", s)
+	}
+	return nil
+}
+
+// Type of the value
+func (x *DeduplicateMode) Type() string {
+	return "string"
+}
+
+// Check it satisfies the interface
+var _ pflag.Value = (*DeduplicateMode)(nil)
+
 // Deduplicate interactively finds duplicate files and offers to
 // delete all but one or rename them to be different. Only useful with
 // Google Drive which can have duplicate file names.
diff --git a/rclone.go b/rclone.go
index a706ebccc..3592a0035 100644
--- a/rclone.go
+++ b/rclone.go
@@ -4,7 +4,6 @@
 package main
 
 // FIXME only attach the remote flags when using a remote???
-// FIXME could do the same for dedupe
 // would probably mean bringing all the flags in to here? Or define some flagsets in fs...
 
 import (
@@ -32,6 +31,7 @@ var (
 	version       bool
 	logFile       = pflag.StringP("log-file", "", "", "Log everything to this file")
 	retries       = pflag.IntP("retries", "", 3, "Retry operations this many times if they fail")
+	dedupeMode    = fs.DeduplicateInteractive
 )
 
 var rootCmd = &cobra.Command{
@@ -82,6 +82,7 @@ func init() {
 		lslCmd, md5sumCmd, sha1sumCmd, sizeCmd, mkdirCmd,
 		rmdirCmd, purgeCmd, deleteCmd, checkCmd, dedupeCmd,
 		configCmd, authorizeCmd, cleanupCmd, versionCmd)
+	dedupeCmd.Flags().VarP(&dedupeMode, "dedupe-mode", "", "Dedupe mode interactive|skip|first|newest|oldest|rename.")
 	cobra.OnInitialize(initConfig)
 }
 
@@ -446,7 +447,7 @@ Google Drive which can have duplicate file names.`,
 		checkArgs(1, 1, cmd, args)
 		fdst := NewFsSrc(args[1])
 		run(false, cmd, func() error {
-			return fs.Deduplicate(fdst, fs.Config.DedupeMode)
+			return fs.Deduplicate(fdst, dedupeMode)
 		})
 	},
 }