diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
index ebc7514d7..4ffe91558 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx
@@ -73,6 +73,7 @@ export function Sidebar(props: { sessionID: string; overlay?: boolean }) {
       <box
         backgroundColor={theme.backgroundPanel}
         width={42}
+        height="100%"
         paddingTop={1}
         paddingBottom={1}
         paddingLeft={2}