diff --git a/kokoro/bazel.sh b/kokoro/bazel.sh
index 1406e92..345df21 100755
--- a/kokoro/bazel.sh
+++ b/kokoro/bazel.sh
@@ -6,6 +6,8 @@
 case "${KOKORO_JOB_NAME}" in
   */windows-*)
     choco upgrade bazel -y -i
+    # VCVARSALL.BAT seems to break otherwise. :/
+    choco install typescript-vs2017 -y -i
     ;;
   *)
     # Use the script provided by Kokoro.