diff --git a/dpgen/data/reaction.py b/dpgen/data/reaction.py
index a76766846..f1d38bccd 100644
--- a/dpgen/data/reaction.py
+++ b/dpgen/data/reaction.py
@@ -116,13 +116,9 @@ def link_trj(jdata):
 
 def run_build_dataset(jdata, mdata, log_file="build_log"):
     work_path = build_path
-    # compatible with new dpdispatcher and old dpgen.dispatcher
-    build_ntasks = mdata["build_resources"].get(
-        "cpu_per_node", mdata["build_resources"]["task_per_node"]
-    )
-    fp_ntasks = mdata["fp_resources"].get(
-        "cpu_per_node", mdata["fp_resources"]["task_per_node"]
-    )
+    # only compatible with new dpdispatcher
+    build_ntasks = mdata["build_resources"]["cpu_per_node"]
+    fp_ntasks = mdata["fp_resources"]["cpu_per_node"]
     build_command = '{cmd} -n {dataset_name} -a {type_map} -d {lammpstrj} -c {cutoff} -s {dataset_size} -k "{qmkeywords}" --nprocjob {nprocjob} --nproc {nproc}'.format(
         cmd=mdata["build_command"],
         type_map=" ".join(jdata["type_map"]),