diff --git a/backend/union/policy/epall.go b/backend/union/policy/epall.go
index 3f765c155..882a238f7 100644
--- a/backend/union/policy/epall.go
+++ b/backend/union/policy/epall.go
@@ -2,7 +2,7 @@ package policy
 
 import (
 	"context"
-	"path/filepath"
+	"path"
 	"sync"
 
 	"github.com/rclone/rclone/backend/union/upstream"
@@ -21,7 +21,7 @@ type EpAll struct {
 	EpFF
 }
 
-func (p *EpAll) epall(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
+func (p *EpAll) epall(ctx context.Context, upstreams []*upstream.Fs, filePath string) ([]*upstream.Fs, error) {
 	var wg sync.WaitGroup
 	ufs := make([]*upstream.Fs, len(upstreams))
 	for i, u := range upstreams {
@@ -29,7 +29,7 @@ func (p *EpAll) epall(ctx context.Context, upstreams []*upstream.Fs, path string
 		i, u := i, u // Closure
 		go func() {
 			rfs := u.RootFs
-			remote := filepath.Join(u.RootPath, path)
+			remote := path.Join(u.RootPath, filePath)
 			if findEntry(ctx, rfs, remote) != nil {
 				ufs[i] = u
 			}
diff --git a/backend/union/policy/epff.go b/backend/union/policy/epff.go
index dd7816ba7..e294cdadb 100644
--- a/backend/union/policy/epff.go
+++ b/backend/union/policy/epff.go
@@ -2,7 +2,7 @@ package policy
 
 import (
 	"context"
-	"path/filepath"
+	"path"
 
 	"github.com/rclone/rclone/backend/union/upstream"
 	"github.com/rclone/rclone/fs"
@@ -16,13 +16,13 @@ func init() {
 // Given the order of the candidates, act on the first one found where the relative path exists.
 type EpFF struct{}
 
-func (p *EpFF) epff(ctx context.Context, upstreams []*upstream.Fs, path string) (*upstream.Fs, error) {
+func (p *EpFF) epff(ctx context.Context, upstreams []*upstream.Fs, filePath string) (*upstream.Fs, error) {
 	ch := make(chan *upstream.Fs)
 	for _, u := range upstreams {
 		u := u // Closure
 		go func() {
 			rfs := u.RootFs
-			remote := filepath.Join(u.RootPath, path)
+			remote := path.Join(u.RootPath, filePath)
 			if findEntry(ctx, rfs, remote) == nil {
 				u = nil
 			}
diff --git a/backend/union/policy/newest.go b/backend/union/policy/newest.go
index 1276955ad..8d4fa8049 100644
--- a/backend/union/policy/newest.go
+++ b/backend/union/policy/newest.go
@@ -2,7 +2,7 @@ package policy
 
 import (
 	"context"
-	"path/filepath"
+	"path"
 	"sync"
 	"time"
 
@@ -20,7 +20,7 @@ type Newest struct {
 	EpAll
 }
 
-func (p *Newest) newest(ctx context.Context, upstreams []*upstream.Fs, path string) (*upstream.Fs, error) {
+func (p *Newest) newest(ctx context.Context, upstreams []*upstream.Fs, filePath string) (*upstream.Fs, error) {
 	var wg sync.WaitGroup
 	ufs := make([]*upstream.Fs, len(upstreams))
 	mtimes := make([]time.Time, len(upstreams))
@@ -30,7 +30,7 @@ func (p *Newest) newest(ctx context.Context, upstreams []*upstream.Fs, path stri
 		go func() {
 			defer wg.Done()
 			rfs := u.RootFs
-			remote := filepath.Join(u.RootPath, path)
+			remote := path.Join(u.RootPath, filePath)
 			if e := findEntry(ctx, rfs, remote); e != nil {
 				ufs[i] = u
 				mtimes[i] = e.ModTime(ctx)
diff --git a/backend/union/policy/policy.go b/backend/union/policy/policy.go
index 0f3456374..0cb2d0007 100644
--- a/backend/union/policy/policy.go
+++ b/backend/union/policy/policy.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"math/rand"
 	"path"
-	"path/filepath"
 	"strings"
 	"time"
 
@@ -95,7 +94,7 @@ func parentDir(absPath string) string {
 }
 
 func clean(absPath string) string {
-	cleanPath := path.Clean(filepath.ToSlash(absPath))
+	cleanPath := path.Clean(absPath)
 	if cleanPath == "." {
 		cleanPath = ""
 	}