diff --git a/servicenow_api/servicenow_models.py b/servicenow_api/servicenow_models.py
index 1b6306b..43368fd 100644
--- a/servicenow_api/servicenow_models.py
+++ b/servicenow_api/servicenow_models.py
@@ -322,7 +322,7 @@ def build_api_parameters(cls, values):
         if "target_sys_id" in values:
             filters.append(f'target_sys_id={values["target_sys_id"]}')
         if "app_sys_id" in values:
-            filters.append(f'app_sys_id={values["app_sys_id"]}')
+            filters.append(f'sys_id={values["app_sys_id"]}')
         if "branch_name" in values:
             filters.append(f'branch_name={values["branch_name"]}')
         if "credential_sys_id" in values: