diff --git a/time_tracker_api/time_entries/time_entries_model.py b/time_tracker_api/time_entries/time_entries_model.py
index 644e3834..ff7c8280 100644
--- a/time_tracker_api/time_entries/time_entries_model.py
+++ b/time_tracker_api/time_entries/time_entries_model.py
@@ -140,7 +140,7 @@ def find_all(
         )
 
         if time_entries:
-            projects_id = [project.project_id for project in time_entries]
+            projects_id = [str(project.project_id) for project in time_entries]
             p_ids = (
                 str(tuple(projects_id)).replace(",", "")
                 if len(projects_id) == 1