diff --git a/src/nvim/move.c b/src/nvim/move.c
index 0b81f34805..adeeec4243 100644
--- a/src/nvim/move.c
+++ b/src/nvim/move.c
@@ -1025,6 +1025,9 @@ void f_screenpos(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     semsg(_(e_invalid_line_number_nr), pos.lnum);
     return;
   }
+  if (pos.col < 0) {
+    pos.col = 0;
+  }
   int row = 0;
   int scol = 0, ccol = 0, ecol = 0;
   textpos2screenpos(wp, &pos, &row, &scol, &ccol, &ecol, false);
diff --git a/test/old/testdir/test_cursor_func.vim b/test/old/testdir/test_cursor_func.vim
index f73bd4f2b9..2f509f2f91 100644
--- a/test/old/testdir/test_cursor_func.vim
+++ b/test/old/testdir/test_cursor_func.vim
@@ -173,6 +173,11 @@ func Test_screenpos()
   call assert_equal(#{col: 1, row: 2, endcol: 1, curscol: 1}, screenpos(win_getid(), 1, 1))
   " nunmenu WinBar.TEST
   setlocal winbar&
+  call assert_equal(#{col: 1, row: 1, endcol: 1, curscol: 1}, screenpos(win_getid(), 1, 1))
+
+  call assert_equal(#{col: 0, row: 0, endcol: 0, curscol: 0}, screenpos(0, 0, 1))
+  call assert_equal(#{col: 0, row: 0, endcol: 0, curscol: 0}, screenpos(0, -1, 1))
+  call assert_equal(#{col: 1, row: 1, endcol: 1, curscol: 1}, screenpos(0, 1, -v:maxcol))
 endfunc
 
 func Test_screenpos_fold()