diff --git a/packages/core/src/services/forbiddenResourceService.test.ts b/packages/core/src/services/forbiddenResourceService.test.ts
index 235995b285..d05a8bfabb 100644
--- a/packages/core/src/services/forbiddenResourceService.test.ts
+++ b/packages/core/src/services/forbiddenResourceService.test.ts
@@ -75,9 +75,9 @@ describe('forbiddenResourceService', () => {
 
     expect(resources).toEqual(
       expect.arrayContaining([
-        { path: '/workspace/node_modules', isDirectory: true },
-        { path: '/workspace/.env', isDirectory: false },
-        { path: '/workspace/secrets', isDirectory: true },
+        { absolutePath: '/workspace/node_modules', isDirectory: true },
+        { absolutePath: '/workspace/.env', isDirectory: false },
+        { absolutePath: '/workspace/secrets', isDirectory: true },
       ]),
     );
     expect(resources).toHaveLength(3);
diff --git a/packages/core/src/services/forbiddenResourceService.ts b/packages/core/src/services/forbiddenResourceService.ts
index 6a26d1c800..4075362dca 100644
--- a/packages/core/src/services/forbiddenResourceService.ts
+++ b/packages/core/src/services/forbiddenResourceService.ts
@@ -139,8 +139,11 @@ function isResourceForbidden(
   isDirectory: boolean,
   ignoreManager: IgnoreManager,
 ): boolean {
-  // The `ignore` package expects paths to be relative to the workspace root.
-  let relativePath = path.relative(workspacePath, resourcePath);
+  // The `ignore` package expects paths to be relative to the workspace root
+  // and strictly uses forward slashes (/) as directory separators.
+  let relativePath = path
+    .relative(workspacePath, resourcePath)
+    .replace(/\\/g, '/');
 
   // Directories must end with a trailing slash to correctly match
   // directory-only rules.