diff --git a/src/nvim/mouse.c b/src/nvim/mouse.c
index 0003d88543..984f746add 100644
--- a/src/nvim/mouse.c
+++ b/src/nvim/mouse.c
@@ -9,6 +9,7 @@
 #include "nvim/buffer_defs.h"
 #include "nvim/charset.h"
 #include "nvim/cursor.h"
+#include "nvim/decoration.h"
 #include "nvim/drawscreen.h"
 #include "nvim/edit.h"
 #include "nvim/eval.h"
@@ -1659,6 +1660,12 @@ bool mouse_comp_pos(win_T *win, int *rowp, int *colp, linenr_T *lnump)
     lnum++;
   }
 
+  // Mouse row reached, adjust lnum for concealed lines.
+  while (decor_conceal_line(win, lnum - 1, false)) {
+    lnum++;
+    hasFolding(win, lnum, NULL, &lnum);
+  }
+
   if (!retval) {
     // Compute the column without wrapping.
     int off = win_col_off(win) - win_col_off2(win);
diff --git a/test/functional/ui/mouse_spec.lua b/test/functional/ui/mouse_spec.lua
index 90b3094082..8d7b0cac86 100644
--- a/test/functional/ui/mouse_spec.lua
+++ b/test/functional/ui/mouse_spec.lua
@@ -2082,4 +2082,12 @@ describe('ui/mouse/input', function()
     feed('<Down><Down><CR>')
     eq('bar', api.nvim_get_var('menustr'))
   end)
+
+  it('below a concealed line #33450', function()
+    api.nvim_set_option_value('conceallevel', 2, {})
+    api.nvim_buf_set_extmark(0, api.nvim_create_namespace(''), 1, 0, { conceal_lines = '' })
+    api.nvim_input_mouse('right', 'press', '', 0, 1, 0)
+    api.nvim_input_mouse('right', 'release', '', 0, 1, 0)
+    eq(3, fn.line('.'))
+  end)
 end)