diff --git a/pkgs/tools/backup/kopia/default.nix b/pkgs/tools/backup/kopia/default.nix
index 47d9dc1b3787..bcf51372f6c5 100644
--- a/pkgs/tools/backup/kopia/default.nix
+++ b/pkgs/tools/backup/kopia/default.nix
@@ -24,12 +24,6 @@ buildGoModule rec {
   '';
 
   postConfigure = ''
-    # make 'vendor' writable
-    cp -L -r vendor tmp-vendor
-    rm -rf vendor
-    chmod -R u+w tmp-vendor
-    mv tmp-vendor vendor
-
     # speakeasy hardcodes /bin/stty https://github.com/bgentry/speakeasy/issues/22
     substituteInPlace vendor/github.com/bgentry/speakeasy/speakeasy_unix.go \
       --replace "/bin/stty" "${coreutils}/bin/stty"