diff --git a/modules/programs/i3status-rust.nix b/modules/programs/i3status-rust.nix
index b03636939..1f9c2bb6d 100644
--- a/modules/programs/i3status-rust.nix
+++ b/modules/programs/i3status-rust.nix
@@ -6,7 +6,18 @@ let
 
   cfg = config.programs.i3status-rust;
 
-  settingsFormat = pkgs.formats.toml { };
+  settingsFormat = pkgs.formats.toml { } // {
+    # Since 0.31, the "block" key has to be first in the TOML output.
+    generate = name: value:
+      pkgs.runCommand name {
+        nativeBuildInputs = [ pkgs.jq pkgs.remarshal ];
+        value = builtins.toJSON value;
+        passAsFile = [ "value" ];
+      } ''
+        jq '.block |= map({block: .block} + del(.block))' "$valuePath" \
+          | json2toml --preserve-key-order > "$out"
+      '';
+  };
 
 in {
   meta.maintainers = with lib.maintainers; [ farlion thiagokokada ];
diff --git a/tests/modules/programs/i3status-rust/with-custom.nix b/tests/modules/programs/i3status-rust/with-custom.nix
index 46887a58e..564e7eb31 100644
--- a/tests/modules/programs/i3status-rust/with-custom.nix
+++ b/tests/modules/programs/i3status-rust/with-custom.nix
@@ -105,12 +105,12 @@
         ${
           pkgs.writeText "i3status-rust-expected-config" ''
             [[block]]
-            alert = 10.0
             block = "disk_space"
+            alert = 10
             info_type = "available"
             interval = 60
             path = "/"
-            warning = 20.0
+            warning = 20
 
             [[block]]
             block = "memory"
diff --git a/tests/modules/programs/i3status-rust/with-default.nix b/tests/modules/programs/i3status-rust/with-default.nix
index 4d10ceea9..f083358d6 100644
--- a/tests/modules/programs/i3status-rust/with-default.nix
+++ b/tests/modules/programs/i3status-rust/with-default.nix
@@ -12,12 +12,12 @@
         ${
           pkgs.writeText "i3status-rust-expected-config" ''
             [[block]]
-            alert = 10.0
             block = "disk_space"
+            alert = 10
             info_type = "available"
             interval = 60
             path = "/"
-            warning = 20.0
+            warning = 20
 
             [[block]]
             block = "memory"
diff --git a/tests/modules/programs/i3status-rust/with-extra-settings.nix b/tests/modules/programs/i3status-rust/with-extra-settings.nix
index 0d8b4663b..f5f89b1e0 100644
--- a/tests/modules/programs/i3status-rust/with-extra-settings.nix
+++ b/tests/modules/programs/i3status-rust/with-extra-settings.nix
@@ -115,12 +115,12 @@
         ${
           pkgs.writeText "i3status-rust-expected-config" ''
             [[block]]
-            alert = 10.0
             block = "disk_space"
+            alert = 10
             info_type = "available"
             interval = 60
             path = "/"
-            warning = 20.0
+            warning = 20
 
             [[block]]
             block = "memory"
diff --git a/tests/modules/programs/i3status-rust/with-multiple-bars.nix b/tests/modules/programs/i3status-rust/with-multiple-bars.nix
index 2a56d6a9c..93c43c755 100644
--- a/tests/modules/programs/i3status-rust/with-multiple-bars.nix
+++ b/tests/modules/programs/i3status-rust/with-multiple-bars.nix
@@ -54,11 +54,11 @@
         ${
           pkgs.writeText "i3status-rust-expected-config" ''
             [[block]]
-            alert = 10.0
             block = "disk_space"
+            alert = 10
             info_type = "available"
             interval = 60
-            warning = 20.0
+            warning = 20
 
             [[block]]
             block = "memory"
diff --git a/tests/modules/programs/i3status-rust/with-version-02xx.nix b/tests/modules/programs/i3status-rust/with-version-02xx.nix
index ec8c2f9a9..870519f87 100644
--- a/tests/modules/programs/i3status-rust/with-version-02xx.nix
+++ b/tests/modules/programs/i3status-rust/with-version-02xx.nix
@@ -14,12 +14,12 @@
             icons = "none"
             theme = "plain"
             [[block]]
-            alert = 10.0
             block = "disk_space"
+            alert = 10
             info_type = "available"
             interval = 60
             path = "/"
-            warning = 20.0
+            warning = 20
 
             [[block]]
             block = "memory"