diff --git a/scripts/build-bazel.ts b/scripts/build-bazel.ts
index e38dd8622c..32d73bf86d 100644
--- a/scripts/build-bazel.ts
+++ b/scripts/build-bazel.ts
@@ -139,7 +139,7 @@ export default async function (
   for (const target of targets) {
     const packageDir = target.replace(/\/\/packages\/(.*):npm_package_archive/, '$1');
     const bazelOutDir = join(bazelBin, 'packages', packageDir, 'npm_package');
-    const tarPath = `${bazelBin}/packages/${packageDir}/npm_package_archive.tar.gz`;
+    const tarPath = `${bazelBin}/packages/${packageDir}/npm_package_archive.tgz`;
     const packageJsonPath = `${bazelOutDir}/package.json`;
     const packageName = require(packageJsonPath).name;
     const destDir = `${distRoot}/${packageName}`;
diff --git a/tools/defaults.bzl b/tools/defaults.bzl
index 50c21b3c82..2b7f8bea67 100644
--- a/tools/defaults.bzl
+++ b/tools/defaults.bzl
@@ -59,7 +59,7 @@ def pkg_npm(name, pkg_deps = [], use_prodmode_output = False, **kwargs):
     in the same folder to exist.
 
     Args:
-        name: Name of the pkg_npm rule. '_archive.tar.gz' is appended to create the tarball.
+        name: Name of the pkg_npm rule. '_archive.tgz' is appended to create the tarball.
         pkg_deps: package.json files of dependent packages. These are used for local path substitutions when --config=local is set.
         use_prodmode_output: False to ship ES5 devmode output, True to ship ESM output. Defaults to False.
         **kwargs: Additional arguments passed to the real pkg_npm.
@@ -116,7 +116,7 @@ def pkg_npm(name, pkg_deps = [], use_prodmode_output = False, **kwargs):
     )
 
     # Copy package.json files to bazel-out so we can use their bazel-out paths to determine
-    # the corresponding package npm package tar.gz path for substitutions.
+    # the corresponding package npm package tgz path for substitutions.
     copy_to_bin(
         name = "package_json_copy",
         srcs = [pkg_json],
@@ -195,7 +195,7 @@ def pkg_npm(name, pkg_deps = [], use_prodmode_output = False, **kwargs):
     pkg_tar(
         name = name + "_archive",
         srcs = [":%s" % name],
-        extension = "tar.gz",
+        extension = "tgz",
         strip_prefix = "./%s" % name,
         visibility = visibility,
     )
diff --git a/tools/link_package_json_to_tarballs.bzl b/tools/link_package_json_to_tarballs.bzl
index 809e3a50ad..a793d78757 100644
--- a/tools/link_package_json_to_tarballs.bzl
+++ b/tools/link_package_json_to_tarballs.bzl
@@ -8,7 +8,7 @@ load("@aspect_bazel_lib//lib:utils.bzl", "to_label")
 def link_package_json_to_tarballs(name, src, pkg_deps, out):
     """Substitute tar paths into a package.json file for the packages it depends on.
 
-    src and pkg_deps must be labels in the bazel-out tree for the derived path to the npm_package_archive.tar.gz to be correct.
+    src and pkg_deps must be labels in the bazel-out tree for the derived path to the npm_package_archive.tgz to be correct.
 
     Args:
         name: Name of the rule
@@ -41,7 +41,7 @@ def link_package_json_to_tarballs(name, src, pkg_deps, out):
         # for the tar for this package as that would create a circular dependency.
         pkg_label = to_label(pkg_dep)
         if pkg_label.package != src_pkg:
-            pkg_tar = "@%s//%s:npm_package_archive.tar.gz" % (pkg_label.workspace_name, pkg_label.package)
+            pkg_tar = "@%s//%s:npm_package_archive.tgz" % (pkg_label.workspace_name, pkg_label.package)
             srcs.append(pkg_tar)
 
         # Deriving the absolute path to the tar in the execroot requries different
@@ -53,7 +53,7 @@ def link_package_json_to_tarballs(name, src, pkg_deps, out):
             name = "%s_%s_filter" % (name, i),
             srcs = srcs,
             cmd = """
-                TAR=$$(dirname $$({abs_path_sandbox} || {abs_path_nosandbox}))/npm_package_archive.tar.gz
+                TAR=$$(dirname $$({abs_path_sandbox} || {abs_path_nosandbox}))/npm_package_archive.tgz
                 PKGNAME=$$(cat $(execpath {pkg_name}))
                 if [[ "$$TAR" != *bazel-out* ]]; then
                     echo "ERROR: package.json passed to substitute_tar_deps must be in the output tree. You can use copy_to_bin to copy a source file to the output tree."