src/cmd/go/internal/modcmd/vendor.go | 3 ++-

diff --git a/src/cmd/go/internal/modcmd/vendor.go b/src/cmd/go/internal/modcmd/vendor.go
index ac1fb7720aad4c86e86cfab8a9193fcad4bde4ed..4ef8481b43cd866c99192c40c724ff55b4111e00 100644
--- a/src/cmd/go/internal/modcmd/vendor.go
+++ b/src/cmd/go/internal/modcmd/vendor.go
@@ -13,6 +13,7 @@ 	"go/build"
 	"io"
 	"io/fs"
 	"os"
+	"path"
 	"path/filepath"
 	"sort"
 	"strings"
@@ -281,7 +282,7 @@ 		}
 		if modPath == pkg {
 			break
 		}
-		pkg = filepath.Dir(pkg)
+		pkg = path.Dir(pkg)
 		dst = filepath.Dir(dst)
 		src = filepath.Dir(src)
 	}