diff --git a/invokeai/backend/util/mps_fixes.py b/invokeai/backend/util/mps_fixes.py
index 5408cffe4a..e4d8da20a9 100644
--- a/invokeai/backend/util/mps_fixes.py
+++ b/invokeai/backend/util/mps_fixes.py
@@ -83,7 +83,7 @@ class ChunkedSlicedAttnProcessor:
         self._sliced_attn_processor = _SlicedAttnProcessor(slice_size)
 
     def __call__(self, attn, hidden_states, encoder_hidden_states=None, attention_mask=None):
-        if self.slice_size != 1:
+        if self.slice_size != 1 or attn.upcast_attention:
             return self._sliced_attn_processor(attn, hidden_states, encoder_hidden_states, attention_mask)
 
         residual = hidden_states