diff --git a/packages/gui-extensions/src/wsl/runtime.test.ts b/packages/gui-extensions/src/wsl/runtime.test.ts
index 709de89f1206..c190d57f1557 100644
--- a/packages/gui-extensions/src/wsl/runtime.test.ts
+++ b/packages/gui-extensions/src/wsl/runtime.test.ts
@@ -66,6 +66,11 @@ test("parseDiscoveredCli returns the discovered path, not a login-shell banner l
   expect(parseDiscoveredCli("")).toBeNull()
   expect(parseDiscoveredCli("Welcome to Ubuntu 24.04 LTS\n")).toBeNull()
   expect(parseDiscoveredCli("opencode\n")).toBeNull()
+  // A banner line can itself be an absolute path to an `opencode` binary; the script's own
+  // line comes after any banner, so the last path-shaped line is the discovered one.
+  expect(parseDiscoveredCli("/opt/old-opencode/bin/opencode\n/home/user/.opencode/bin/opencode\n")).toBe(
+    "/home/user/.opencode/bin/opencode",
+  )
 })
 
 // Runs the real discoverScript through `sh` against a fake installed CLI,
diff --git a/packages/gui-extensions/src/wsl/runtime.ts b/packages/gui-extensions/src/wsl/runtime.ts
index bdb8678233cd..d09cd3ce1d91 100644
--- a/packages/gui-extensions/src/wsl/runtime.ts
+++ b/packages/gui-extensions/src/wsl/runtime.ts
@@ -87,13 +87,15 @@ export function parseProbeAnswer(output: string) {
 
 export function parseDiscoveredCli(output: string) {
   // Discovery runs in a login shell (`sh -lc`), so a banner, MOTD or profile echo can precede
-  // the discovered path on stdout. The script prints only the CLI's absolute path, so take the
-  // line that is an absolute path to an `opencode` binary instead of the first line.
+  // the discovered path on stdout, and a banner line can itself be an absolute path to an
+  // `opencode` binary. The script prints only the CLI's absolute path, after any banner, so
+  // take the last line that is an absolute path to an `opencode` binary instead of the first
+  // matching line — the same last-candidate rule parseVersion and parseProbeAnswer follow.
   return (
     output
       .split(/\r?\n/g)
       .map((line) => line.trim())
-      .find((line) => line.startsWith("/") && line.endsWith("/opencode")) ?? null
+      .findLast((line) => line.startsWith("/") && line.endsWith("/opencode")) ?? null
   )
 }