diff --git a/src/intel/dev/gen_device_info.c b/src/intel/dev/gen_device_info.c
index 85fa978f9c1..0ab3c354df5 100644
--- a/src/intel/dev/gen_device_info.c
+++ b/src/intel/dev/gen_device_info.c
@@ -1104,7 +1104,7 @@ update_from_topology(struct gen_device_info *devinfo,
 
       for (int b = 0; b < devinfo->subslice_slice_stride; b++) {
          devinfo->num_subslices[s] +=
-            __builtin_popcount(devinfo->subslice_masks[b]);
+            __builtin_popcount(devinfo->subslice_masks[s * devinfo->subslice_slice_stride + b]);
       }
       n_subslices += devinfo->num_subslices[s];
    }