diff --git a/site/src/pages/AgentsPage/components/ChatsSidebar/dialogs/ChatSearchResults.tsx b/site/src/pages/AgentsPage/components/ChatsSidebar/dialogs/ChatSearchResults.tsx
index c49c900332..18c29f6f04 100644
--- a/site/src/pages/AgentsPage/components/ChatsSidebar/dialogs/ChatSearchResults.tsx
+++ b/site/src/pages/AgentsPage/components/ChatsSidebar/dialogs/ChatSearchResults.tsx
@@ -297,7 +297,10 @@ const ChatSearchResultRow: FC<ChatSearchResultRowProps> = ({
 						aria-hidden="true"
 					/>
 				)}
-				{shortRelativeTime(chat.updated_at)}
+				{/* Pin the ignored mask width so Chromatic does not diff bounding rect changes. */}
+				<span data-chromatic="ignore" className="inline-block w-7 text-right">
+					{shortRelativeTime(chat.updated_at)}
+				</span>
 			</span>
 		</Link>
 	);
diff --git a/site/src/pages/AgentsPage/components/ChatsSidebar/tree/ChatTreeNode.tsx b/site/src/pages/AgentsPage/components/ChatsSidebar/tree/ChatTreeNode.tsx
index 169eb8d0e5..9412b6a871 100644
--- a/site/src/pages/AgentsPage/components/ChatsSidebar/tree/ChatTreeNode.tsx
+++ b/site/src/pages/AgentsPage/components/ChatsSidebar/tree/ChatTreeNode.tsx
@@ -336,9 +336,15 @@ export const ChatTreeNode: FC<ChatTreeNodeProps> = ({ chat, isChildNode }) => {
 												aria-hidden="true"
 											/>
 										) : (
-											<span data-chromatic="ignore">
-												{shortRelativeTime(chat.updated_at)}
-											</span>
+											<>
+												{/* Pin the ignored mask width so Chromatic does not diff bounding rect changes. */}
+												<span
+													data-chromatic="ignore"
+													className="inline-block w-7 text-right"
+												>
+													{shortRelativeTime(chat.updated_at)}
+												</span>
+											</>
 										)}
 									</span>
 								)}