diff --git a/nixos/modules/system/boot/networkd.nix b/nixos/modules/system/boot/networkd.nix
index c11aaeaeb6dc..4bacf0f126a4 100644
--- a/nixos/modules/system/boot/networkd.nix
+++ b/nixos/modules/system/boot/networkd.nix
@@ -30,10 +30,14 @@ let
     (assertValueOneOf "UDPSegmentationOffload" boolValues)
     (assertValueOneOf "GenericReceiveOffload" boolValues)
     (assertValueOneOf "LargeReceiveOffload" boolValues)
-    (assertRange "RxChannels" 1 4294967295)
-    (assertRange "TxChannels" 1 4294967295)
-    (assertRange "OtherChannels" 1 4294967295)
-    (assertRange "CombinedChannels" 1 4294967295)
+    (assertInt "RxChannels")
+    (assertMinimum "RxChannels" 1)
+    (assertInt "TxChannels")
+    (assertMinimum "TxChannels" 1)
+    (assertInt "OtherChannels")
+    (assertMinimum "OtherChannels" 1)
+    (assertInt "CombinedChannels")
+    (assertMinimum "CombinedChannels" 1)
   ];
 
   checkNetdev = checkUnitConfig "Netdev" [
@@ -226,7 +230,8 @@ let
     (assertValueOneOf "UseTimezone" boolValues)
     (assertValueOneOf "CriticalConnection" boolValues)
     (assertValueOneOf "RequestBroadcast" boolValues)
-    (assertRange "RouteTable" 0 4294967295)
+    (assertInt "RouteTable")
+    (assertMinimum "RouteTable" 0)
     (assertValueOneOf "RapidCommit" boolValues)
   ];
 
diff --git a/nixos/modules/system/boot/systemd-lib.nix b/nixos/modules/system/boot/systemd-lib.nix
index 8b37bf8d35d8..9c8d4a026b4a 100644
--- a/nixos/modules/system/boot/systemd-lib.nix
+++ b/nixos/modules/system/boot/systemd-lib.nix
@@ -73,11 +73,19 @@ in rec {
     optional (attr ? ${name} && !(min <= attr.${name} && max >= attr.${name}))
       "Systemd ${group} field `${name}' is outside the range [${toString min},${toString max}]";
 
+  assertMinimum = name: min: group: attr:
+    optional (attr ? ${name} && attr.${name} < min)
+      "Systemd ${group} field `${name}' must be greater than or equal to ${toString min}";
+
   assertOnlyFields = fields: group: attr:
     let badFields = filter (name: ! elem name fields) (attrNames attr); in
     optional (badFields != [ ])
       "Systemd ${group} has extra fields [${concatStringsSep " " badFields}].";
 
+  assertInt = name: group: attr:
+    optional (attr ? ${name} && !isInt attr.${name})
+      "Systemd ${group} field `${name}' is not an integer";
+
   checkUnitConfig = group: checks: attrs: let
     # We're applied at the top-level type (attrsOf unitOption), so the actual
     # unit options might contain attributes from mkOverride that we need to