diff --git a/LOFAR LBA imaging tutorial v4.ipynb b/LOFAR LBA imaging tutorial v4.ipynb
index 73ff050..dbc45f0 100644
--- a/LOFAR LBA imaging tutorial v4.ipynb	
+++ b/LOFAR LBA imaging tutorial v4.ipynb	
@@ -141,6 +141,27 @@
     "    station_type = \"intl\""
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "NameError",
+     "evalue": "name 'os' is not defined",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
+      "\u001b[0;32m<ipython-input-2-38adb07b9031>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mos\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mmakedirs\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'results'\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mexist_ok\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;32mTrue\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[0;31mNameError\u001b[0m: name 'os' is not defined"
+     ]
+    }
+   ],
+   "source": [
+    "os.makedirs('results', exist_ok=True)"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 11,
diff --git a/lofarimaging/singlestationutil.py b/lofarimaging/singlestationutil.py
index 50584c1..7952538 100644
--- a/lofarimaging/singlestationutil.py
+++ b/lofarimaging/singlestationutil.py
@@ -267,10 +267,7 @@ def make_ground_image(xst_filename,
     else:
         station_type = "intl"
 
-    try:
-        os.mkdir('results')
-    except FileExistsError:
-        pass
+    os.makedirs('results', exist_ok=True)
 
     # Distill metadata from filename
     obsdatestr, obstimestr, _, rcu_mode, _, subbandname = cubename.rstrip(".dat").split("_")