diff --git a/prototorch/models/abstract.py b/prototorch/models/abstract.py
index 42b0bb3..9198bfb 100644
--- a/prototorch/models/abstract.py
+++ b/prototorch/models/abstract.py
@@ -2,6 +2,7 @@
 
 import logging
 
+import prototorch
 import pytorch_lightning as pl
 import torch
 import torch.nn.functional as F
@@ -186,21 +187,32 @@ class SupervisedPrototypeModel(PrototypeModel):
 
     def log_acc(self, distances, targets, tag):
         preds = self.predict_from_distances(distances)
-        accuracy = torchmetrics.functional.accuracy(preds.int(), targets.int())
-        # `.int()` because FloatTensors are assumed to be class probabilities
+        accuracy = torchmetrics.functional.accuracy(
+            preds.int(),
+            targets.int(),
+            "multiclass",
+            num_classes=self.num_classes,
+        )
 
-        self.log(tag,
-                 accuracy,
-                 on_step=False,
-                 on_epoch=True,
-                 prog_bar=True,
-                 logger=True)
+        self.log(
+            tag,
+            accuracy,
+            on_step=False,
+            on_epoch=True,
+            prog_bar=True,
+            logger=True,
+        )
 
     def test_step(self, batch, batch_idx):
         x, targets = batch
 
         preds = self.predict(x)
-        accuracy = torchmetrics.functional.accuracy(preds.int(), targets.int())
+        accuracy = torchmetrics.functional.accuracy(
+            preds.int(),
+            targets.int(),
+            "multiclass",
+            num_classes=self.num_classes,
+        )
 
         self.log("test_acc", accuracy)
 
diff --git a/prototorch/models/cbc.py b/prototorch/models/cbc.py
index 2e38394..6e3bd9a 100644
--- a/prototorch/models/cbc.py
+++ b/prototorch/models/cbc.py
@@ -55,14 +55,20 @@ class CBC(SiameseGLVQ):
     def training_step(self, batch, batch_idx, optimizer_idx=None):
         y_pred, train_loss = self.shared_step(batch, batch_idx, optimizer_idx)
         preds = torch.argmax(y_pred, dim=1)
-        accuracy = torchmetrics.functional.accuracy(preds.int(),
-                                                    batch[1].int())
-        self.log("train_acc",
-                 accuracy,
-                 on_step=False,
-                 on_epoch=True,
-                 prog_bar=True,
-                 logger=True)
+        accuracy = torchmetrics.functional.accuracy(
+            preds.int(),
+            batch[1].int(),
+            "multiclass",
+            num_classes=self.num_classes,
+        )
+        self.log(
+            "train_acc",
+            accuracy,
+            on_step=False,
+            on_epoch=True,
+            prog_bar=True,
+            logger=True,
+        )
         return train_loss
 
     def predict(self, x):