diff --git a/tools/lint/prettier.sh b/tools/lint/prettier.sh
index dc29522..adea3f2 100755
--- a/tools/lint/prettier.sh
+++ b/tools/lint/prettier.sh
@@ -11,6 +11,10 @@
   { echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
 # --- end runfiles.bash initialization v2 ---
 
+# The rules_nodejs runfiles discovery needs some help.
+runfiles_export_envvars
+export RUNFILES="${RUNFILES_DIR}"
+
 PRETTIER="$(rlocation npm/prettier/bin/prettier.sh)"
 PRETTIER="$(readlink -f "${PRETTIER}")"
 readonly PRETTIER