diff --git a/volume/mounts/lcow_parser.go b/volume/mounts/lcow_parser.go
index c572349c8a..2dbd2d164b 100644
--- a/volume/mounts/lcow_parser.go
+++ b/volume/mounts/lcow_parser.go
@@ -2,8 +2,10 @@ package mounts // import "github.com/docker/docker/volume/mounts"
 
 import (
 	"errors"
+	"fmt"
 	"path"
 	"regexp"
+	"strings"
 
 	"github.com/docker/docker/api/types/mount"
 )
@@ -37,8 +39,8 @@ var lcowValidators mountValidator = func(m *mount.Mount) error {
 	if m.Type == mount.TypeNamedPipe {
 		return errors.New("Linux containers on Windows do not support named pipe mounts")
 	}
-	if err := windowsValidateRegex(m.Target, lcowMountDestinationRegex); err != nil {
-		return err
+	if !lcowMountDestinationRegex.MatchString(strings.ToLower(m.Target)) {
+		return fmt.Errorf("invalid mount path: '%s'", m.Target)
 	}
 	return nil
 }
diff --git a/volume/mounts/windows_parser.go b/volume/mounts/windows_parser.go
index a3157105f8..4beee769d7 100644
--- a/volume/mounts/windows_parser.go
+++ b/volume/mounts/windows_parser.go
@@ -155,17 +155,14 @@ var windowsValidators mountValidator = func(m *mount.Mount) error {
 	if err := windowsValidateNotRoot(m.Target); err != nil {
 		return err
 	}
-	return windowsValidateRegex(m.Target, mountDestinationRegexp)
+	if !mountDestinationRegexp.MatchString(strings.ToLower(m.Target)) {
+		return fmt.Errorf("invalid mount path: '%s'", m.Target)
+	}
+	return nil
 }
 
-func windowsValidateRegex(p string, r *regexp.Regexp) error {
-	if r.MatchString(strings.ToLower(p)) {
-		return nil
-	}
-	return fmt.Errorf("invalid mount path: '%s'", p)
-}
 func windowsValidateAbsolute(p string) error {
-	if err := windowsValidateRegex(p, mountDestinationRegexp); err != nil {
+	if !mountDestinationRegexp.MatchString(strings.ToLower(p)) {
 		return fmt.Errorf("invalid mount path: '%s' mount path must be absolute", p)
 	}
 	return nil