diff --git a/HellionChat/Ui/Components/MessageList.cs b/HellionChat/Ui/Components/MessageList.cs
index 6024736..c0189da 100644
--- a/HellionChat/Ui/Components/MessageList.cs
+++ b/HellionChat/Ui/Components/MessageList.cs
@@ -99,7 +99,7 @@ internal sealed class MessageList
     // swaps between two differently sized faces), FontsEnabled and UseHellionFont
     // (both swap the face outright, and their two size fields default to the same
     // 12.75f -- so the fingerprint did not move while the glyph widths did).
-    private LayoutFingerprint BuildLayoutFingerprint(float contentWidth)
+    private LayoutFingerprint BuildLayoutFingerprint(Tab tab, float contentWidth)
     {
         var fonts = _fonts.EffectiveFontFingerprint();
         return new LayoutFingerprint(
@@ -112,6 +112,8 @@ internal sealed class MessageList
             Plugin.Config.FontsEnabled,
             Plugin.Config.UseHellionFont,
             Plugin.Config.ItalicEnabled,
+            Plugin.Config.Use24HourClock,
+            tab.DisplayTimestamp,
             (int)Plugin.Config.NameFormMode,
             (int)Plugin.Config.WorldSuffixMode,
             contentWidth,
@@ -131,7 +133,7 @@ internal sealed class MessageList
             _fingerprintGates[tab.Identifier] = gate;
         }
 
-        if (!gate.ShouldInvalidate(BuildLayoutFingerprint(contentWidth), nowMs))
+        if (!gate.ShouldInvalidate(BuildLayoutFingerprint(tab, contentWidth), nowMs))
             return;
 
         using var messages = tab.Messages.GetReadOnly(3);
diff --git a/HellionChat/Util/LayoutFingerprint.cs b/HellionChat/Util/LayoutFingerprint.cs
index be2db40..f507d07 100644
--- a/HellionChat/Util/LayoutFingerprint.cs
+++ b/HellionChat/Util/LayoutFingerprint.cs
@@ -12,6 +12,8 @@ internal readonly record struct LayoutFingerprint(
     bool FontsEnabled,
     bool UseHellionFont,
     bool ItalicEnabled,
+    bool Use24Hour,
+    bool ShowTimestamp,
     int NameForm,
     int WorldSuffix,
     float Width,
@@ -21,8 +23,17 @@ internal readonly record struct LayoutFingerprint(
     // Toggles: they land on a new value in one frame and stay there. Waiting on
     // them would leave the planner running against the previous density's
     // heights while the rows are already painted the new way.
-    internal (bool, bool, bool, bool, int, int) Discrete =>
-        (Compact, FontsEnabled, UseHellionFont, ItalicEnabled, NameForm, WorldSuffix);
+    internal (bool, bool, bool, bool, bool, bool, int, int) Discrete =>
+        (
+            Compact,
+            FontsEnabled,
+            UseHellionFont,
+            ItalicEnabled,
+            Use24Hour,
+            ShowTimestamp,
+            NameForm,
+            WorldSuffix
+        );
 }
 
 // Dragging a window edge or the Dalamud UI-scale slider moves the continuous