diff --git a/third_party/rust/chromium_crates_io/gnrt_config.toml b/third_party/rust/chromium_crates_io/gnrt_config.toml
index 7ef48a35efe..463d27ad3b6 100644
--- a/third_party/rust/chromium_crates_io/gnrt_config.toml
+++ b/third_party/rust/chromium_crates_io/gnrt_config.toml
@@ -382,7 +382,7 @@ if (epoch == "2") {
 [crate.typenum]
 extra_build_script_src_roots = [ "../build" ]
 build_script_outputs = [ "consts.rs", "op.rs" ]
-extra_kv = { rustenv = [ "TYPENUM_BUILD_CONSTS=\" + rebase_path(target_gen_dir, get_path_info(crate_root, \"dir\")) + \"/lib/consts.rs", "TYPENUM_BUILD_OP=\" + rebase_path(target_gen_dir, get_path_info(crate_root, \"dir\")) + \"/lib/op.rs" ] }
+extra_kv = { rustenv = [ "TYPENUM_BUILD_CONSTS=\" + rebase_path(target_gen_dir, root_build_dir) + \"/lib/consts.rs", "TYPENUM_BUILD_OP=\" + rebase_path(target_gen_dir, root_build_dir) + \"/lib/op.rs" ] }
 
 [crate.uint]
 license_files = ['../../../../../common/licenses/Apache-2.0']
diff --git a/third_party/rust/typenum/v1/BUILD.gn b/third_party/rust/typenum/v1/BUILD.gn
index 831a3323726..05b94776676 100644
--- a/third_party/rust/typenum/v1/BUILD.gn
+++ b/third_party/rust/typenum/v1/BUILD.gn
@@ -49,11 +49,9 @@ cargo_crate("lib") {
     "op.rs",
   ]
   rustenv = [
-    "TYPENUM_BUILD_CONSTS=" +
-        rebase_path(target_gen_dir, get_path_info(crate_root, "dir")) +
+    "TYPENUM_BUILD_CONSTS=" + rebase_path(target_gen_dir, root_build_dir) +
         "/lib/consts.rs",
-    "TYPENUM_BUILD_OP=" +
-        rebase_path(target_gen_dir, get_path_info(crate_root, "dir")) +
+    "TYPENUM_BUILD_OP=" + rebase_path(target_gen_dir, root_build_dir) +
         "/lib/op.rs",
   ]
   rustflags = []