diff --git a/tests/metrics/test_compute_metrics.py b/tests/metrics/test_compute_metrics.py
index 2c7c346..ed92616 100644
--- a/tests/metrics/test_compute_metrics.py
+++ b/tests/metrics/test_compute_metrics.py
@@ -146,6 +146,14 @@ def test_arguments(self):
                                      evaluate_range=('a', 'b', 'c'),
                                      device=self.device)
 
+        with pytest.raises(ValueError):
+            compute_metrics.evaluate(metric=metric,
+                                     log_dir=self.log_dir,
+                                     netG=self.netG,
+                                     dataset=self.dataset,
+                                     evaluate_range=(100, 100, 100, 100),
+                                     device=self.device)
+
         with pytest.raises(ValueError):
             compute_metrics.evaluate(metric=metric,
                                      log_dir=self.log_dir,
diff --git a/torch_mimicry/metrics/compute_metrics.py b/torch_mimicry/metrics/compute_metrics.py
index 4a0b6c7..2e9682b 100644
--- a/torch_mimicry/metrics/compute_metrics.py
+++ b/torch_mimicry/metrics/compute_metrics.py
@@ -48,7 +48,7 @@ def evaluate(metric,
     if evaluate_range:
         if (type(evaluate_range) != tuple
                 or not all(map(lambda x: type(x) == int, evaluate_range))
-                or not len(x) == 3):
+                or not len(evaluate_range) == 3):
             raise ValueError(
                 "evaluate_range must be a tuple of ints (start, end, step).")