diff --git a/nixos/modules/services/networking/chrony.nix b/nixos/modules/services/networking/chrony.nix
index 1cd678e7c621..a38142b4a08f 100644
--- a/nixos/modules/services/networking/chrony.nix
+++ b/nixos/modules/services/networking/chrony.nix
@@ -64,7 +64,7 @@ in
 
   ###### implementation
 
-  config = mkIf config.services.chrony.enable {
+  config = mkIf cfg.enable {
 
     # Make chronyc available in the system path
     environment.systemPackages = [ pkgs.chrony ];
@@ -101,12 +101,14 @@ in
         home = stateDir;
       };
 
-    systemd.services.ntpd.enable = false;
+    systemd.services.ntpd.enable = mkForce false;
 
     systemd.services.chronyd =
       { description = "chrony NTP daemon";
 
         wantedBy = [ "multi-user.target" ];
+        wants = [ "time-sync.target" ];
+        before = [ "time-sync.target" ];
         after = [ "network.target" ];
         conflicts = [ "ntpd.service" "systemd-timesyncd.service" ];
 
diff --git a/nixos/modules/services/networking/ntpd.nix b/nixos/modules/services/networking/ntpd.nix
index 5256fc9bc071..c8a085679280 100644
--- a/nixos/modules/services/networking/ntpd.nix
+++ b/nixos/modules/services/networking/ntpd.nix
@@ -82,6 +82,8 @@ in
       { description = "NTP Daemon";
 
         wantedBy = [ "multi-user.target" ];
+        wants = [ "time-sync.target" ];
+        before = [ "time-sync.target" ];
 
         preStart =
           ''
diff --git a/nixos/modules/services/networking/openntpd.nix b/nixos/modules/services/networking/openntpd.nix
index e53fc574fbea..a8625fa2fa91 100644
--- a/nixos/modules/services/networking/openntpd.nix
+++ b/nixos/modules/services/networking/openntpd.nix
@@ -64,7 +64,8 @@ in
     systemd.services.openntpd = {
       description = "OpenNTP Server";
       wantedBy = [ "multi-user.target" ];
-      wants = [ "network-online.target" ];
+      wants = [ "network-online.target" "time-sync.target" ];
+      before = [ "time-sync.target" ];
       after = [ "dnsmasq.service" "bind.service" "network-online.target" ];
       serviceConfig.ExecStart = "${package}/sbin/ntpd -d -f ${cfgFile} ${cfg.extraOptions}";
     };