diff --git a/slurm-eff-tool.py b/slurm-eff-tool.py
index 619841b..04c14d8 100755
--- a/slurm-eff-tool.py
+++ b/slurm-eff-tool.py
@@ -1676,7 +1676,7 @@ def histo_graphs(out_rows: list[OutputRow], args: argparse.Namespace):
         "mem_eff": "",
         "planned_time": " (h)",
         "usedmem": " (GB)",
-        "vpu_eff": "",
+        "cpu_eff": "",
         "start": "",
         "time_eff": "",
         "walltime": " (h)"