diff --git a/lua/nui/popup/border.lua b/lua/nui/popup/border.lua
index 4618e2e8..0160a49f 100644
--- a/lua/nui/popup/border.lua
+++ b/lua/nui/popup/border.lua
@@ -299,6 +299,8 @@ end
 ---@return nui_popup_border_internal_position
 local function calculate_position(border)
   local position = vim.deepcopy(border.popup._.position)
+  position.col = position.col - math.floor(border._.size_delta.width / 2 + 0.5)
+  position.row = position.row - math.floor(border._.size_delta.height / 2 + 0.5)
   return position
 end
 
diff --git a/tests/nui/popup/init_spec.lua b/tests/nui/popup/init_spec.lua
index c91a643d..1e53b88c 100644
--- a/tests/nui/popup/init_spec.lua
+++ b/tests/nui/popup/init_spec.lua
@@ -578,9 +578,13 @@ describe("nui.popup", function()
 
         local border_win_config = vim.api.nvim_win_get_config(popup.border.winid)
         local border_row, border_col = border_win_config.row[vim.val_idx], border_win_config.col[vim.val_idx]
+        local border_width, border_height = border_win_config.width, border_win_config.height
 
-        eq(border_row, position.row)
-        eq(border_col, position.col)
+        local delta_width = border_width - win_config.width
+        local delta_height = border_height - win_config.height
+
+        eq(border_row + math.floor(delta_height / 2 + 0.5), position.row)
+        eq(border_col + math.floor(delta_width / 2 + 0.5), position.col)
       else
         eq(row, position.row)
         eq(col, position.col)