diff --git a/packages/temporal-bun-sdk/package.json b/packages/temporal-bun-sdk/package.json
index 072622adf0..00c81aa235 100644
--- a/packages/temporal-bun-sdk/package.json
+++ b/packages/temporal-bun-sdk/package.json
@@ -58,10 +58,6 @@
       "types": "./dist/src/workflow/index.d.ts",
       "default": "./dist/src/workflow/index.js"
     },
-    "./workflow/runtime": {
-      "types": "./dist/src/workflow/runtime/index.d.ts",
-      "default": "./dist/src/workflow/runtime/index.js"
-    },
     "./worker": {
       "types": "./dist/src/worker.d.ts",
       "default": "./dist/src/worker.js"
diff --git a/packages/temporal-bun-sdk/tests/packaging/manifest-packaging.test.ts b/packages/temporal-bun-sdk/tests/packaging/manifest-packaging.test.ts
index 12d9df0910..ce161e7a0c 100644
--- a/packages/temporal-bun-sdk/tests/packaging/manifest-packaging.test.ts
+++ b/packages/temporal-bun-sdk/tests/packaging/manifest-packaging.test.ts
@@ -10,6 +10,7 @@ type TemporalSdkPackageJson = {
   files?: string[]
   scripts?: Record<string, string>
   keywords?: string[]
+  exports?: Record<string, string | { default?: string; types?: string }>
 }
 
 const packageRoot = join(import.meta.dir, '../..')
@@ -93,6 +94,18 @@ describe('temporal-bun-sdk packaging manifest', () => {
     expect(bins['temporal-bun-worker']).toBe('./dist/src/bin/start-worker.js')
   })
 
+  test('exports only subpaths backed by source modules', async () => {
+    const packageJson = await loadPackageJson()
+
+    for (const [subpath, target] of Object.entries(packageJson.exports ?? {})) {
+      const defaultTarget = typeof target === 'string' ? target : target.default
+      if (!defaultTarget?.startsWith('./dist/src/') || !defaultTarget.endsWith('.js')) continue
+
+      const sourcePath = join(packageRoot, defaultTarget.replace('./dist/', '').replace(/\.js$/, '.ts'))
+      expect(existsSync(sourcePath), `${subpath} -> ${defaultTarget}`).toBeTrue()
+    }
+  })
+
   test('exposes adoption metadata for npm and agent discovery', async () => {
     const packageJson = await loadPackageJson()
     const keywords = packageJson.keywords ?? []