diff --git a/src/sys.lua b/src/sys.lua
index 8788af6..ec41dfd 100644
--- a/src/sys.lua
+++ b/src/sys.lua
@@ -274,7 +274,8 @@ M.get_core_topology = function()
       pure.partial(gmatch_to_tableN, '(%d+),(%d+)')
    )
    local out =
-      i_o.execute_cmd('lscpu -y -p=core,cpu | grep -v \'^#\' | sort -k1,1n')
+      i_o.execute_cmd('lscpu -y -p=core,cpu | grep -v \'^#\' | sort -k1,1n -t,')
+   print(out)
    return pure.fmap_maybe(f, out)
 end