diff --git a/install-node-exporter.sh b/install-node-exporter.sh
index 531ebb9..0ca2be3 100755
--- a/install-node-exporter.sh
+++ b/install-node-exporter.sh
@@ -7,7 +7,7 @@ apt install prometheus-node-exporter
 
 chown prometheus:prometheus $PROM_DIR
 
-echo "ARGS+= --collector.textfile.directory $PROM_DIR" \
+echo "ARGS+=' --collector.textfile.directory '$PROM_DIR" \
      >> /etc/default/prometheus-node-exporter
 
 install programs/rdl_prometheus /usr/local/bin/