diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 5821002cad42e2b32a221dabe7febdc164ad6742..6fc4b8eeab428f7b10bf56ba5c07eba5789b59a7 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -27,8 +27,7 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
 
 	slice_length = sizeof(sseu->slice_mask);
 	subslice_length = sseu->max_slices *
-		DIV_ROUND_UP(sseu->max_subslices,
-			     BITS_PER_TYPE(sseu->subslice_mask[0]));
+		DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
 	eu_length = sseu->max_slices * sseu->max_subslices *
 		DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);