diff --git a/lib/vtansi.lua b/lib/vtansi.lua
index 1831a5f..6ae22ac 100644
--- a/lib/vtansi.lua
+++ b/lib/vtansi.lua
@@ -98,7 +98,7 @@ function vtansi.vtemu(gpu,bn) -- table number -- function -- takes GPU component
      cx,cy = 1, cy+1
      checkCursor()
     elseif cc == "\t" then
-     wb=wb..(" "):rep(8*((cx+9)//8))
+     wb=wb..(" "):rep((((cx//8)+1) * 8) - cx + 1)
     elseif cc == "\27" then
      flushwb()
      mode = 1