diff --git a/executor/app/main.py b/executor/app/main.py
index 508ee62..5daf7e6 100644
--- a/executor/app/main.py
+++ b/executor/app/main.py
@@ -452,9 +452,9 @@ def get_size(self, location_path):
     dask_cluster_opts["processes"] = True
     port = int(os.getenv("DASK_DASHBOARD_PORT", 8787))
     dask_cluster_opts["dashboard_address"] = f":{port}"
-    dask_cluster_opts["n_workers"] = os.getenv("DASK_N_WORKERS", 1)
+    dask_cluster_opts["n_workers"] = int(os.getenv("DASK_N_WORKERS", 1))
     dask_cluster_opts["memory_limit"] = os.getenv("DASK_MEMORY_LIMIT", "auto")
-    dask_cluster_opts['thread_per_worker'] = os.getenv("DASK_THREADS_PER_WORKER", 8)
+    dask_cluster_opts['thread_per_worker'] = int(os.getenv("DASK_THREADS_PER_WORKER", 8))
 
 
     executor = Executor(broker=broker, store_path=store_path, dask_cluster_opts=dask_cluster_opts)