diff --git a/packages/coding-agent/src/modes/interactive/components/dynamic-border.ts b/packages/coding-agent/src/modes/interactive/components/dynamic-border.ts
index b835ae0a..76e5c7b7 100644
--- a/packages/coding-agent/src/modes/interactive/components/dynamic-border.ts
+++ b/packages/coding-agent/src/modes/interactive/components/dynamic-border.ts
@@ -7,8 +7,10 @@ import { theme } from "../theme/theme.js";
 export class DynamicBorder implements Component {
 	private color: (str: string) => string;
 
-	constructor(color: (str: string) => string = (str) => theme.fg("border", str)) {
-		this.color = color;
+	constructor(color?: (str: string) => string) {
+		// Use provided color function, or default to theme border color
+		// Theme may not be initialized at construction time, so we check at render time
+		this.color = color ?? ((str) => (theme ? theme.fg("border", str) : str));
 	}
 
 	invalidate(): void {