diff --git a/brats_segmentation_3d.ipynb b/brats_segmentation_3d.ipynb
index 16ca68886d..8551681a78 100644
--- a/brats_segmentation_3d.ipynb
+++ b/brats_segmentation_3d.ipynb
@@ -178,7 +178,7 @@
    ],
    "source": [
     "directory = os.environ.get(\"MONAI_DATA_DIRECTORY\")\n",
-    "root_dir = tempfile.mkdtemp if directory is None else directory\n",
+    "root_dir = tempfile.mkdtemp() if directory is None else directory\n",
     "print(root_dir)"
    ]
   },
diff --git a/models_ensemble.ipynb b/models_ensemble.ipynb
index 49cb486b19..37ef42b9da 100644
--- a/models_ensemble.ipynb
+++ b/models_ensemble.ipynb
@@ -150,7 +150,7 @@
    ],
    "source": [
     "directory = os.environ.get(\"MONAI_DATA_DIRECTORY\")\n",
-    "root_dir = tempfile.mkdtemp if directory is None else directory\n",
+    "root_dir = tempfile.mkdtemp() if directory is None else directory\n",
     "print(root_dir)"
    ]
   },
diff --git a/nifti_read_example.ipynb b/nifti_read_example.ipynb
index 0f94fa5035..3ceffe2af5 100644
--- a/nifti_read_example.ipynb
+++ b/nifti_read_example.ipynb
@@ -137,7 +137,7 @@
    ],
    "source": [
     "directory = os.environ.get(\"MONAI_DATA_DIRECTORY\")\n",
-    "root_dir = tempfile.mkdtemp if directory is None else directory\n",
+    "root_dir = tempfile.mkdtemp() if directory is None else directory\n",
     "print(root_dir)"
    ]
   },
diff --git a/persistent_dataset_speed.ipynb b/persistent_dataset_speed.ipynb
index 80131f46d1..ef86fb91ea 100644
--- a/persistent_dataset_speed.ipynb
+++ b/persistent_dataset_speed.ipynb
@@ -160,7 +160,7 @@
    ],
    "source": [
     "directory = os.environ.get(\"MONAI_DATA_DIRECTORY\")\n",
-    "root_dir = tempfile.mkdtemp if directory is None else directory\n",
+    "root_dir = tempfile.mkdtemp() if directory is None else directory\n",
     "print(root_dir)"
    ]
   },