diff --git a/rosie/core/__init__.py b/rosie/core/__init__.py
index 078c55c..a75f30e 100644
--- a/rosie/core/__init__.py
+++ b/rosie/core/__init__.py
@@ -28,7 +28,7 @@ def __init__(self, settings, adapter):
         self.settings = settings
         self.dataset = adapter.dataset
         self.data_path = adapter.path
-        if (UNIQUE_IDS):
+        if self.settings.UNIQUE_IDS:
             self.suspicions = self.dataset[self.settings.UNIQUE_IDS].copy()
         else:
             self.suspicions = self.dataset.copy()