diff --git a/lua/brokencode/ui.lua b/lua/brokencode/ui.lua
index b53bad6..75af1bc 100644
--- a/lua/brokencode/ui.lua
+++ b/lua/brokencode/ui.lua
@@ -164,6 +164,7 @@ function M.input(callback)
 
   local function close(send)
     if send then
+      vim.cmd("stopinsert")
       local text = table.concat(vim.api.nvim_buf_get_lines(buffer, 0, -1, false), "\n")
       if vim.trim(text) ~= "" then
         callback(text)
diff --git a/tests/ui_spec.lua b/tests/ui_spec.lua
index 4d3991e..da03465 100644
--- a/tests/ui_spec.lua
+++ b/tests/ui_spec.lua
@@ -60,3 +60,26 @@ callbacks[3](nil, { { type = "user", text = "old session" } })
 assert(ui.current_session == "ses_new", "old polling replaced the active session")
 
 client.messages = messages
+
+local submitted
+ui.input(function(text) submitted = text end)
+local input_buf = vim.api.nvim_get_current_buf()
+vim.api.nvim_buf_set_lines(input_buf, 0, -1, false, { "send me" })
+
+local commands = {}
+local original_cmd = vim.cmd
+vim.cmd = function(command)
+  table.insert(commands, command)
+  original_cmd(command)
+end
+
+for _, mapping in ipairs(vim.api.nvim_buf_get_keymap(input_buf, "i")) do
+  if mapping.lhs == "<C-S>" then
+    mapping.callback()
+    break
+  end
+end
+vim.cmd = original_cmd
+
+assert(submitted == "send me", "Ctrl-S did not submit the message")
+assert(vim.tbl_contains(commands, "stopinsert"), "Ctrl-S did not return to normal mode")