diff --git a/test/common_utils.py b/test/common_utils.py
index c815786b586..61f06994801 100644
--- a/test/common_utils.py
+++ b/test/common_utils.py
@@ -406,26 +406,21 @@ def make_bounding_boxes(
     canvas_size=DEFAULT_SIZE,
     *,
     format=datapoints.BoundingBoxFormat.XYXY,
-    batch_dims=(),
     dtype=None,
     device="cpu",
 ):
     def sample_position(values, max_value):
         # We cannot use torch.randint directly here, because it only allows integer scalars as values for low and high.
         # However, if we have batch_dims, we need tensors as limits.
-        return torch.stack([torch.randint(max_value - v, ()) for v in values.flatten().tolist()]).reshape(values.shape)
+        return torch.stack([torch.randint(max_value - v, ()) for v in values.tolist()])
 
     if isinstance(format, str):
         format = datapoints.BoundingBoxFormat[format]
 
     dtype = dtype or torch.float32
 
-    if any(dim == 0 for dim in batch_dims):
-        return datapoints.BoundingBoxes(
-            torch.empty(*batch_dims, 4, dtype=dtype, device=device), format=format, canvas_size=canvas_size
-        )
-
-    h, w = [torch.randint(1, c, batch_dims) for c in canvas_size]
+    num_objects = 1
+    h, w = [torch.randint(1, c, (num_objects,)) for c in canvas_size]
     y = sample_position(h, canvas_size[0])
     x = sample_position(w, canvas_size[1])
 
@@ -448,11 +443,12 @@ def sample_position(values, max_value):
     )
 
 
-def make_detection_mask(size=DEFAULT_SIZE, *, num_objects=5, batch_dims=(), dtype=None, device="cpu"):
+def make_detection_mask(size=DEFAULT_SIZE, *, dtype=None, device="cpu"):
     """Make a "detection" mask, i.e. (*, N, H, W), where each object is encoded as one of N boolean masks"""
+    num_objects = 1
     return datapoints.Mask(
         torch.testing.make_tensor(
-            (*batch_dims, num_objects, *size),
+            (num_objects, *size),
             low=0,
             high=2,
             dtype=dtype or torch.bool,