diff --git a/lua/quicker/init.lua b/lua/quicker/init.lua
index 8339d13..42ae32b 100644
--- a/lua/quicker/init.lua
+++ b/lua/quicker/init.lua
@@ -140,6 +140,7 @@ end
 ---Open the quickfix or loclist window.
 ---@param opts? quicker.OpenOpts
 M.open = function(opts)
+  local util = require("quicker.util")
   ---@type {loclist: boolean, focus: boolean, height?: integer, min_height: integer, max_height: integer, open_cmd_mods?: quicker.OpenCmdMods}
   opts = vim.tbl_deep_extend("keep", opts or {}, {
     loclist = false,
@@ -161,8 +162,11 @@ M.open = function(opts)
     height = #vim.fn.getqflist()
   end
 
-  height = math.min(opts.max_height, math.max(opts.min_height, height))
-  vim.api.nvim_win_set_height(0, height)
+  -- only set the height if the quickfix is not a full-height vsplit
+  if not util.is_full_height_vsplit(0) then
+    height = math.min(opts.max_height, math.max(opts.min_height, height))
+    vim.api.nvim_win_set_height(0, height)
+  end
 
   if not opts.focus then
     vim.cmd.wincmd({ args = { "p" } })
diff --git a/lua/quicker/util.lua b/lua/quicker/util.lua
index 045c943..3794091 100644
--- a/lua/quicker/util.lua
+++ b/lua/quicker/util.lua
@@ -71,4 +71,25 @@ M.get_lnum_extmarks = function(bufnr, lnum, line_len, ns)
   end, extmarks)
 end
 
+---Return true if the window is a full-height leaf window
+---@param winid? integer
+---@return boolean
+M.is_full_height_vsplit = function(winid)
+  if not winid or winid == 0 then
+    winid = vim.api.nvim_get_current_win()
+  end
+  local layout = vim.fn.winlayout()
+  -- If the top layout is not vsplit, then it's not a vertical leaf
+  if layout[1] ~= "row" then
+    return false
+  end
+  for _, v in ipairs(layout[2]) do
+    if v[1] == "leaf" and v[2] == winid then
+      return true
+    end
+  end
+
+  return false
+end
+
 return M