diff --git a/notebooks/AGIPD/Characterize_AGIPD_Gain_Darks_NBC.ipynb b/notebooks/AGIPD/Characterize_AGIPD_Gain_Darks_NBC.ipynb
index 9b770097d9b506a8435798df40d5539099847fbe..520666c8579b6e3e1954b840d1b5fedf9f53d7d6 100644
--- a/notebooks/AGIPD/Characterize_AGIPD_Gain_Darks_NBC.ipynb
+++ b/notebooks/AGIPD/Characterize_AGIPD_Gain_Darks_NBC.ipynb
@@ -263,7 +263,7 @@
     "instrument_src_mod = instrument_src.format(modules[0])\n",
     "\n",
     "agipd_ctrl_dark = AgipdCtrlRuns(\n",
-    "    raw_folder=in_folder, runs=list(runs_dict.keys))\n",
+    "    raw_folder=in_folder, runs=list(runs_dict.keys()))\n",
     "if mem_cells == 0:\n",
     "    mem_cells = agipd_ctrl_dark.get_memory_cells()\n",
     "\n",