diff --git a/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb b/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
index fc8913230eacddea36f4c21b9ab1f557455bf743..dc6d2c9cf04811928bc023d9d15c20e602cf8eb8 100644
--- a/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
+++ b/notebooks/Gotthard2/Correction_Gotthard2_NBC.ipynb
@@ -326,7 +326,7 @@
     "        mask[index, ...],\n",
     "        g,\n",
     "        const_data[mod][\"Offset\"],\n",
-    "        const_data[mod][\"RelativeGain\"],\n",
+    "        const_data[mod][\"RelativeGain\"].astype(np.float32, copy=False),\n",
     "        const_data[mod][\"Mask\"],\n",
     "        apply_offset=offset_correction,\n",
     "        apply_gain=gain_correction,\n",