diff --git a/lib/server/api_server.py b/lib/server/api_server.py
index 1b38589..9066e9f 100755
--- a/lib/server/api_server.py
+++ b/lib/server/api_server.py
@@ -404,8 +404,8 @@ def add_job_handler():
                 worker.parent = job_data.get("parent", worker.parent)
                 worker.name = job_data.get("name", worker.name)
                 worker.priority = int(job_data.get('priority', worker.priority))
-                worker.start_frame = job_data.get("start_frame", worker.start_frame)
-                worker.end_frame = job_data.get("end_frame", worker.end_frame)
+                worker.start_frame = int(job_data.get("start_frame", worker.start_frame))
+                worker.end_frame = int(job_data.get("end_frame", worker.end_frame))
 
                 # determine if we can / should split the job
                 if server.config.get('enable_split_jobs', False) and (worker.total_frames > 1) and not worker.parent: