diff --git a/files/generate-config.sh b/files/generate-config.sh
index 4729a62..540c72d 100644
--- a/files/generate-config.sh
+++ b/files/generate-config.sh
@@ -1,8 +1,6 @@
 #!/bin/bash
 set -euo pipefail
 
-tmpfile=`mktemp`
-
 (
 
 cat /etc/prometheus/conf.d/*.conf
@@ -13,9 +11,14 @@ echo "  alertmanagers:"
 echo "scrape_configs:"
 cat /etc/prometheus/conf.d/scrape_configs/*.conf
 
-) > $tmpfile
+) > /etc/prometheus/prometheus.yml.new
 
-chmod 0644 $tmpfile
-mv $tmpfile /etc/prometheus/prometheus.yml
-/usr/bin/systemctl reload prometheus
-/usr/bin/systemctl reload prometheus-alertmanager || true
+chmod 0644 /etc/prometheus/prometheus.yml.new
+
+if ! diff -q /etc/prometheus/prometheus.yml.new /etc/prometheus/prometheus.yml > /dev/null; then
+	mv /etc/prometheus/prometheus.yml.new /etc/prometheus/prometheus.yml
+	/usr/bin/systemctl reload prometheus
+	/usr/bin/systemctl reload prometheus-alertmanager || true
+else
+	rm -f /etc/prometheus/prometheus.yml.new
+fi