diff --git a/labeling/labellers/fixed_time_three_class_balanced.py b/labeling/labellers/fixed_time_three_class_balanced.py
index bece946..07ae563 100644
--- a/labeling/labellers/fixed_time_three_class_balanced.py
+++ b/labeling/labellers/fixed_time_three_class_balanced.py
@@ -18,7 +18,7 @@ class FixedTimeHorionThreeClassBalancedEventLabeller(EventLabeller):
 
         forward_returns = create_forward_returns(returns, self.time_horizon)
         cutoff_point = returns.index[-self.time_horizon]
-        event_start_times[event_start_times < cutoff_point]
+        event_start_times = event_start_times[event_start_times < cutoff_point]
         event_candidates = forward_returns[event_start_times]
 
         def get_bins_threeway(x):
diff --git a/labeling/labellers/fixed_time_three_class_imbalanced.py b/labeling/labellers/fixed_time_three_class_imbalanced.py
index b2278e6..d9aa107 100644
--- a/labeling/labellers/fixed_time_three_class_imbalanced.py
+++ b/labeling/labellers/fixed_time_three_class_imbalanced.py
@@ -17,7 +17,7 @@ class FixedTimeHorionThreeClassImbalancedEventLabeller(EventLabeller):
 
         forward_returns = create_forward_returns(returns, self.time_horizon)
         cutoff_point = returns.index[-self.time_horizon]
-        event_start_times[event_start_times < cutoff_point]
+        event_start_times = event_start_times[event_start_times < cutoff_point]
         event_candidates = forward_returns[event_start_times]
 
         def get_bins_threeway(x):
diff --git a/labeling/labellers/fixed_time_two_class.py b/labeling/labellers/fixed_time_two_class.py
index ca9cb17..aee5d52 100644
--- a/labeling/labellers/fixed_time_two_class.py
+++ b/labeling/labellers/fixed_time_two_class.py
@@ -18,7 +18,7 @@ class FixedTimeHorionTwoClassEventLabeller(EventLabeller):
 
         forward_returns = create_forward_returns(returns, self.time_horizon)
         cutoff_point = returns.index[-self.time_horizon]
-        event_start_times[event_start_times < cutoff_point]
+        event_start_times = event_start_times[event_start_times < cutoff_point]
         event_candidates = forward_returns[event_start_times]
 
         def get_class_binary(x: float) -> int:
diff --git a/labeling/process.py b/labeling/process.py
index d979b25..5f573e4 100644
--- a/labeling/process.py
+++ b/labeling/process.py
@@ -27,7 +27,7 @@ def label_data(
             "% of overlapping events",
         )
 
-    X = X.filter(items=events.index, axis=0)
+    X = X.loc[events.index]
     y = events["label"]
     forward_returns = events["returns"]