diff --git a/pymc/logprob/mixture.py b/pymc/logprob/mixture.py
index ce6a11d208..3709ef756e 100644
--- a/pymc/logprob/mixture.py
+++ b/pymc/logprob/mixture.py
@@ -62,7 +62,7 @@
     is_basic_idx,
 )
 from pytensor.tensor.type import TensorType
-from pytensor.tensor.type_other import NoneConst, NoneTypeT, SliceConstant, SliceType
+from pytensor.tensor.type_other import NoneConst, NoneTypeT, SliceType
 from pytensor.tensor.variable import TensorVariable
 
 from pymc.logprob.abstract import (
@@ -289,9 +289,12 @@ def find_measurable_index_mixture(fgraph, node):
         # We don't support (non-scalar) integer array indexing as it can pick repeated values,
         # but the Mixture logprob assumes all mixture values are independent
         if any(
-            indices.dtype.startswith("int") and sum(1 - b for b in indices.type.broadcastable) > 0
+            (
+                isinstance(indices, TensorVariable)
+                and indices.dtype.startswith("int")
+                and any(not b for b in indices.type.broadcastable)
+            )
             for indices in mixing_indices
-            if not isinstance(indices, SliceConstant)
         ):
             return None