diff --git a/dmlcloud/core/distributed.py b/dmlcloud/core/distributed.py
index 1a62ab9..681f809 100644
--- a/dmlcloud/core/distributed.py
+++ b/dmlcloud/core/distributed.py
@@ -285,9 +285,20 @@ def _init_process_group_slurm(port=DEFAULT_PORT, **kwargs):
     _WorkerInfo.RANK = int(os.environ['SLURM_PROCID'])
     _WorkerInfo.WORLD_SIZE = int(os.environ['SLURM_NTASKS'])
     _WorkerInfo.LOCAL_RANK = int(os.environ['SLURM_LOCALID'])
-    _WorkerInfo.LOCAL_WORLD_SIZE = int(os.environ['SLURM_STEP_TASKS_PER_NODE'])
     _WorkerInfo.NODE_ID = int(os.environ['SLURM_NODEID'])
 
+    # Determine local world size via SLURM_TASKS_PER_NODE
+    # Format example: 2(x3),4,1
+    tasks_per_node_raw = os.environ['SLURM_TASKS_PER_NODE'].split(',')
+    tasks_per_node = []
+    for t in tasks_per_node_raw:
+        if '(x' in t:
+            ntasks, nnodes = t.split('(x')
+            tasks_per_node.extend([int(ntasks)] * int(nnodes[:-1]))
+        else:
+            tasks_per_node.append(int(t))
+    _WorkerInfo.LOCAL_WORLD_SIZE = tasks_per_node[_WorkerInfo.NODE_ID]
+
     ip = os.environ['SLURM_SRUN_COMM_HOST']
 
     dist.init_process_group(