diff --git a/etc/chrony/sources.d/dna-moi.sources b/etc/chrony/sources.d/dna-moi.sources
index 01c07a63..ecf00103 100644
--- a/etc/chrony/sources.d/dna-moi.sources
+++ b/etc/chrony/sources.d/dna-moi.sources
@@ -1,2 +1,2 @@
 # DNA & Moi NTP server, no idea on smearing, I hope not
-pool ntp.dnainternet.fi maxsources 3 iburst
+pool ntp.dnainternet.fi maxsources 3 iburst prefer
diff --git a/etc/chrony/sources.d/elisa.sources b/etc/chrony/sources.d/elisa.sources
index 7144e847..1edc90bd 100644
--- a/etc/chrony/sources.d/elisa.sources
+++ b/etc/chrony/sources.d/elisa.sources
@@ -1,4 +1,4 @@
 # Elisa NTP servers, no idea on smearing, I hope not
-server ntp1.kolumbus.fi iburst
-server ntp2.kolumbus.fi iburst
-server ntp.saunalahti.fi iburst
+server ntp1.kolumbus.fi iburst prefer
+server ntp2.kolumbus.fi iburst prefer
+server ntp.saunalahti.fi iburst prefer
diff --git a/etc/chrony/sources.d/hetzner.sources b/etc/chrony/sources.d/hetzner.sources
index 5d42afd5..e447cabd 100644
--- a/etc/chrony/sources.d/hetzner.sources
+++ b/etc/chrony/sources.d/hetzner.sources
@@ -1,2 +1,2 @@
 # Hetzner.de NTP servers
-pool ntp.hetzner.de iburst maxsources 3
+pool ntp.hetzner.de iburst maxsources 3 prefer
diff --git a/etc/chrony/sources.d/nts-servers.sources b/etc/chrony/sources.d/nts-servers.sources
index 376a2b28..6f98704c 100644
--- a/etc/chrony/sources.d/nts-servers.sources
+++ b/etc/chrony/sources.d/nts-servers.sources
@@ -14,7 +14,7 @@
 # NOTE: NTS support requires Chrony 4.0 or newer!
 
 # Cloudflare NTS, anycast, works probably anywhere. No leap second smearing.
-pool time.cloudflare.com maxsources 2 iburst nts
+pool time.cloudflare.com maxsources 2 iburst nts prefer
 
 # Finland, https://ntp.miuku.net
 server ntp.miuku.net iburst nts
diff --git a/etc/chrony/sources.d/telia.sources b/etc/chrony/sources.d/telia.sources
index db7a195a..bf45a1ca 100644
--- a/etc/chrony/sources.d/telia.sources
+++ b/etc/chrony/sources.d/telia.sources
@@ -1,2 +1,2 @@
 # Telia NTP servers, no idea on smearing, I hope not
-pool ntp.inet.fi iburst maxsources 3
+pool ntp.inet.fi iburst maxsources 3 prefer