diff --git a/src/scripts/pr-check.js b/src/scripts/pr-check.js
index 677416b..7a8b145 100644
--- a/src/scripts/pr-check.js
+++ b/src/scripts/pr-check.js
@@ -99,10 +99,9 @@ export function validateRequiredFields(pkg) {
   console.log('Validating URLs...');
   const urlFields = ['sourceUrl', 'homepage'];
   for (const field of urlFields) {
-    try {
-      new URL(pkg[field]);
-    } catch (error) {
-      throw new Error(`Package ${pkg.name} has invalid ${field} URL: ${pkg[field]}`);
+    const url = pkg[field];
+    if (!url.startsWith('http://') && !url.startsWith('https://')) {
+      throw new Error(`Package ${pkg.name} has invalid ${field} URL: ${url} - must start with http:// or https://`);
     }
   }
 }
diff --git a/src/scripts/pr-check.test.js b/src/scripts/pr-check.test.js
new file mode 100644
index 0000000..1820136
--- /dev/null
+++ b/src/scripts/pr-check.test.js
@@ -0,0 +1,42 @@
+import { validateRequiredFields } from './pr-check.js';
+
+describe('validateRequiredFields', () => {
+  test('accepts valid GitHub URLs', () => {
+    const pkg = {
+      name: 'test-package',
+      description: 'Test package',
+      vendor: 'Test Vendor',
+      sourceUrl: 'https://github.com/owner/repo',
+      homepage: 'https://github.com/owner/repo',
+      license: 'MIT',
+      runtime: 'node'
+    };
+    expect(() => validateRequiredFields(pkg)).not.toThrow();
+  });
+
+  test('rejects invalid URLs without protocol', () => {
+    const pkg = {
+      name: 'test-package',
+      description: 'Test package',
+      vendor: 'Test Vendor',
+      sourceUrl: 'github.com/owner/repo',
+      homepage: 'https://github.com/owner/repo',
+      license: 'MIT',
+      runtime: 'node'
+    };
+    expect(() => validateRequiredFields(pkg)).toThrow(/invalid sourceUrl URL/);
+  });
+
+  test('accepts both http and https protocols', () => {
+    const pkg = {
+      name: 'test-package',
+      description: 'Test package',
+      vendor: 'Test Vendor',
+      sourceUrl: 'http://github.com/owner/repo',
+      homepage: 'https://github.com/owner/repo',
+      license: 'MIT',
+      runtime: 'node'
+    };
+    expect(() => validateRequiredFields(pkg)).not.toThrow();
+  });
+});