diff --git a/ceratopsian-theme/plymouth/ceratopsian.script b/ceratopsian-theme/plymouth/ceratopsian.script
index deea07d..80ac4dc 100644
--- a/ceratopsian-theme/plymouth/ceratopsian.script
+++ b/ceratopsian-theme/plymouth/ceratopsian.script
@@ -330,7 +330,7 @@ fun get_message_label (label, is_fake, is_action_line) {
     message_label.height = message_image.GetHeight ();
 
     # Center the line horizontally
-    message_label.x = Window.GetX () + Window.GetWidth () / 2 - message_label.width / 2;
+    message_label.x = (Window.GetWidth () - message_label.width) / 2;
 
     message_label.y = top_of_the_text;
 
@@ -365,7 +365,7 @@ fun get_fsck_label (label, is_fake) {
     fsck_label.height = fsck_label.image.GetHeight ();
 
     # Centre the label horizontally
-    fsck_label.x = Window.GetX () + Window.GetWidth () / 2 - fsck_label.width / 2;
+    fsck_label.x = (Window.GetWidth () - fsck_label.width) / 2;
 
     local.first_label = get_message_label (label, 1, 0);
 
@@ -482,7 +482,7 @@ fun password_dialogue_setup (message_label) {
     entry.sprite.SetImage (entry.image);
 
     # Centre the box horizontally
-    entry.x = Window.GetX () + Window.GetWidth () / 2 - entry.image.GetWidth () / 2;
+    entry.x = (Window.GetWidth () - entry.image.GetWidth ()) / 2;
 
     # Put the entry below the second label.
     entry.y = message_notification[2].y + label.height * 1.5;
@@ -530,7 +530,7 @@ fun display_password_callback (prompt, bullets) {
     spaces = Math.Int( (password_dialogue.entry.image.GetWidth () - (margin * 2)) / (bullet_width / 2 ) );
     #DebugMedium ("spaces = " + spaces + ", bullets = " + bullets);
     bullets_area.width = margin + spaces * (bullet_width / 2);
-    bullets_area.x = Window.GetX () + Window.GetWidth () / 2 - bullets_area.width / 2;
+    bullets_area.x = (Window.GetWidth () - bullets_area.width) / 2;
     #DebugBottom ("pwd_entry (x,y) = " + password_dialogue.entry.x + "," + password_dialogue.entry.y
     #             + "), bullets_area.x = " + bullets_area.x + ", bullets_area.width = " + bullets_area.width);
     if (bullets > spaces)
diff --git a/debian/changelog b/debian/changelog
index 28373d6..c39df14 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -5,6 +5,11 @@ desktop-base (14.0.0~pre2) UNRELEASED; urgency=medium
     dependencies that would normally try to connect to the D-Bus session bus
     during build.
 
+  [ Aurélien COUDERC ]
+  * Fix ceratopsian-theme’s plymouth password/fsck prompts off-center on
+    multi-monitor mixed-resolution set-ups. Thanks Shaun Lewis for the patch.
+    (Closes: #1110858)
+
  -- Aurélien COUDERC <coucouf@debian.org>  Sun, 17 Aug 2025 23:33:02 +0200
 
 desktop-base (14.0.0~pre1) unstable; urgency=medium