--- a/taskcluster/scripts/builder/build-haz-linux.sh
+++ b/taskcluster/scripts/builder/build-haz-linux.sh
@@ -49,17 +49,17 @@ GECKO_DIR=$( cd "$GECKO_DIR" && pwd )
 # Directory to populate with tooltool-installed tools
 export TOOLTOOL_DIR="$WORKSPACE"
 
 # Directory to hold the (useless) object files generated by the analysis.
 export MOZ_OBJDIR="$WORKSPACE/obj-analyzed"
 mkdir -p "$MOZ_OBJDIR"
 
 if [ -n "$DO_TOOLTOOL" ]; then
-  ( cd $TOOLTOOL_DIR; python $GECKO_DIR/python/mozbuild/mozbuild/action/tooltool.py --url https://api.pub.build.mozilla.org/tooltool/ -m $GECKO_DIR/$TOOLTOOL_MANIFEST fetch -c $TOOLTOOL_CACHE )
+  ( cd $TOOLTOOL_DIR; $GECKO_DIR/mach artifact toolchain -v --tooltool-url https://api.pub.build.mozilla.org/tooltool/ --tooltool-manifest $GECKO_DIR/$TOOLTOOL_MANIFEST --cache-dir $TOOLTOOL_CACHE )
 fi
 
 export NO_MERCURIAL_SETUP_CHECK=1
 
 if [[ "$PROJECT" = "browser" ]]; then (
     cd "$WORKSPACE"
     set "$WORKSPACE"
     . setup-ccache.sh