diff --git a/InvenTree/InvenTree/settings.py b/InvenTree/InvenTree/settings.py
index 6c9d4a9b55..476be9aa28 100644
--- a/InvenTree/InvenTree/settings.py
+++ b/InvenTree/InvenTree/settings.py
@@ -100,6 +100,7 @@ INSTALLED_APPS = [
     'import_export',                # Import / export tables to file
     'django_cleanup',               # Automatically delete orphaned MEDIA files
     'qr_code',                      # Generate QR codes
+    'mptt',                         # Modified Preorder Tree Traversal
 ]
 
 LOGGING = {
diff --git a/requirements.txt b/requirements.txt
index cf45d83248..0f94e4cc14 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ pillow>=5.0.0                   # Image manipulation
 djangorestframework>=3.6.2      # DRF framework
 django-cors-headers>=2.5.3      # CORS headers extension for DRF
 django_filter>=1.0.2            # Extended filtering options
+django-mptt>=0.10.0             # Modified Preorder Tree Traversal
 django-dbbackup==3.2.0          # Database backup / restore functionality
 coreapi>=2.3.0                  # API documentation
 pygments>=2.2.0                 # Syntax highlighting