diff --git a/packages/coding-agent/test/git-update.test.ts b/packages/coding-agent/test/git-update.test.ts
index 169bc937..c8c2cd68 100644
--- a/packages/coding-agent/test/git-update.test.ts
+++ b/packages/coding-agent/test/git-update.test.ts
@@ -53,8 +53,10 @@ describe("DefaultPackageManager git update", () => {
 	let settingsManager: SettingsManager;
 	let packageManager: DefaultPackageManager;
 
-	// Git source that maps to our installed directory structure
-	const gitSource = "github.com/test/extension";
+	// Git source that maps to our installed directory structure.
+	// Must use "git:" prefix so parseSource() treats it as a git source
+	// (bare "github.com/..." is not recognized as a git URL).
+	const gitSource = "git:github.com/test/extension";
 
 	beforeEach(() => {
 		tempDir = join(tmpdir(), `git-update-test-${Date.now()}-${Math.random().toString(36).slice(2)}`);