diff --git a/packages/core/src/utils/user_id.test.ts b/packages/core/src/utils/user_id.test.ts
index 81b99ef4..5d9c72e4 100644
--- a/packages/core/src/utils/user_id.test.ts
+++ b/packages/core/src/utils/user_id.test.ts
@@ -28,21 +28,19 @@ describe('user_id', () => {
 
       expect(result).toBeDefined();
       expect(typeof result).toBe('string');
-      expect(result.length).toBeGreaterThan(0);
 
       // Should be consistent on subsequent calls
       const secondCall = getObfuscatedGoogleAccountId();
       expect(secondCall).toBe(result);
     });
 
-    it('should return the same as installation ID when no Google Account ID is cached', () => {
+    it('should return empty string when no Google Account ID is cached', () => {
       // In a clean test environment, there should be no cached Google Account ID
       // so getObfuscatedGoogleAccountId should fall back to installation ID
       const googleAccountIdResult = getObfuscatedGoogleAccountId();
-      const installationIdResult = getInstallationId();
 
       // They should be the same when no Google Account ID is cached
-      expect(googleAccountIdResult).toBe(installationIdResult);
+      expect(googleAccountIdResult).toBe('');
     });
   });
 });
diff --git a/packages/core/src/utils/user_id.ts b/packages/core/src/utils/user_id.ts
index 4f17bf96..5238fc3c 100644
--- a/packages/core/src/utils/user_id.ts
+++ b/packages/core/src/utils/user_id.ts
@@ -73,9 +73,8 @@ export function getObfuscatedGoogleAccountId(): string {
       return googleAccountId;
     }
   } catch (_error) {
-    // If there's any error accessing Google Account ID, fall back to installation ID
+    // If there's any error accessing Google Account ID, just return empty string
   }
 
-  // Fall back to installation ID when no Google Account ID is cached or on error
-  return getInstallationId();
+  return '';
 }