diff --git a/taskcluster/scripts/misc/tooltool-download.sh b/taskcluster/scripts/misc/tooltool-download.sh
index 654e00ed65b0..04a1ae009629 100644
--- a/taskcluster/scripts/misc/tooltool-download.sh
+++ b/taskcluster/scripts/misc/tooltool-download.sh
@@ -2,8 +2,22 @@
 
 cd $WORKSPACE/build/src
 
+case "`uname -s`" in
+Linux)
+    TOOLTOOL_AUTH_FILE=/builds/relengapi.tok
+    ;;
+MINGW*)
+    TOOLTOOL_AUTH_FILE=c:/builds/relengapi.tok
+    ;;
+esac
+
 TOOLTOOL_DL_FLAGS=
 
+if [ -e "$TOOLTOOL_AUTH_FILE" ]; then
+    # When the worker has the relengapi token pass it down
+    TOOLTOOL_DL_FLAGS="${TOOLTOOL_DL_FLAGS=} --authentication-file=$TOOLTOOL_AUTH_FILE"
+fi
+
 if [ -n "$RELENGAPI_PORT" ]; then
     # When the worker has the relengapi proxy setup, use it.
     TOOLTOOL_DL_FLAGS="${TOOLTOOL_DL_FLAGS=} --tooltool-url=http://relengapi/tooltool/"