diff --git a/common/mflagext/listvar.go b/common/mflagext/listvar.go
deleted file mode 100644
index c385e2cd..00000000
--- a/common/mflagext/listvar.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package mflagext
-
-import (
-	"fmt"
-
-	"github.com/weaveworks/common/mflag"
-)
-
-type listOpts struct {
-	value      *[]string
-	hasBeenSet bool
-}
-
-func ListVar(p *[]string, names []string, value []string, usage string) {
-	*p = value
-	mflag.Var(&listOpts{p, false}, names, usage)
-}
-
-func (opts *listOpts) Set(value string) error {
-	if opts.hasBeenSet {
-		(*opts.value) = append((*opts.value), value)
-	} else {
-		(*opts.value) = []string{value}
-		opts.hasBeenSet = true
-	}
-	return nil
-}
-
-func (opts *listOpts) String() string {
-	return fmt.Sprintf("%v", []string(*opts.value))
-}
diff --git a/prog/weaveproxy/main.go b/prog/weaveproxy/main.go
index 3f6b0644..bf326187 100644
--- a/prog/weaveproxy/main.go
+++ b/prog/weaveproxy/main.go
@@ -6,9 +6,9 @@ import (
 	"strings"
 
 	"github.com/weaveworks/common/mflag"
+	"github.com/weaveworks/common/mflagext"
 	"github.com/weaveworks/common/signals"
 	"github.com/weaveworks/weave/common"
-	"github.com/weaveworks/weave/common/mflagext"
 	"github.com/weaveworks/weave/proxy"
 )