diff --git a/module/vt100.lua b/module/vt100.lua
index b7ef1a8..3522fdc 100644
--- a/module/vt100.lua
+++ b/module/vt100.lua
@@ -61,16 +61,16 @@ function vt100emu(gpu) -- takes GPU component proxy *gpu* and returns a function
      cx, cy = tonumber(tx), tonumber(ty)
      mode = "n"
     elseif cc == "A" then -- cursor up
-     cy = cy - tonumber(cs) or 1
+     cy = cy - (tonumber(cs) or 1)
      mode = "n"
     elseif cc == "B" then -- cursor down
-     cy = cy + tonumber(cs) or 1
+     cy = cy + (tonumber(cs) or 1)
      mode = "n"
     elseif cc == "C" then -- cursor right
-     cx = cx + tonumber(cs) or 1
+     cx = cx + (tonumber(cs) or 1)
      mode = "n"
     elseif cc == "D" then -- cursor left
-     cx = cx - tonumber(cs) or 1
+     cx = cx - (tonumber(cs) or 1)
      mode = "n"
     elseif cc == "h" and lc == "7" then -- enable line wrap
      lw = true