diff --git a/demos/Wiener_Filter.ipynb b/demos/Wiener_Filter.ipynb
index 0d2c60217d1edd4e3bb8228cfbc9b07b28423be7..eb514196829fe9f7d71395f5584e57f994543b57 100644
--- a/demos/Wiener_Filter.ipynb
+++ b/demos/Wiener_Filter.ipynb
@@ -687,7 +687,7 @@
    },
    "outputs": [],
    "source": [
-    "precise = (np.abs(s_data-m_data) < uncertainty )\n",
+    "precise = (np.abs(s_data-m_data) < uncertainty)\n",
     "print(\"Error within uncertainty map bounds: \" + str(np.sum(precise) * 100 / N_pixels**2) + \"%\")\n",
     "\n",
     "plt.figure(figsize=(15,10))\n",