diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 1236703fc..9b706ba20 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Jan 13
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Jan 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -3244,6 +3244,8 @@ getbufinfo([{dict}])
 			bufnr		Buffer number.
 			changed		TRUE if the buffer is modified.
 			changedtick	Number of changes made to the buffer.
+			command		TRUE if the buffer belongs to the
+					command-line window |cmdwin|.
 			hidden		TRUE if the buffer is hidden.
 			lastused	Timestamp in seconds, like
 					|localtime()|, when the buffer was
diff --git a/src/buffer.c b/src/buffer.c
index 64e492647..62c396a53 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5936,6 +5936,8 @@ buf_spname(buf_T *buf)
 #endif
 	if (buf->b_fname != NULL)
 	    return buf->b_fname;
+	if (buf == cmdwin_buf)
+	    return (char_u *)_("[Command Line]");
 #ifdef FEAT_JOB_CHANNEL
 	if (bt_prompt(buf))
 	    return (char_u *)_("[Prompt]");
diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index e611c52e4..6ec734d37 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -653,6 +653,7 @@ get_buffer_info(buf_T *buf)
     dict_add_number(dict, "changedtick", CHANGEDTICK(buf));
     dict_add_number(dict, "hidden",
 			    buf->b_ml.ml_mfp != NULL && buf->b_nwindows == 0);
+    dict_add_number(dict, "command", buf == cmdwin_buf);
 
     // Get a reference to buffer variables
     dict_add_dict(dict, "variables", buf->b_vars);
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 139bb6fa2..1731d2952 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4537,9 +4537,6 @@ open_cmdwin(void)
     }
     cmdwin_buf = curbuf;
 
-    apply_autocmds(EVENT_BUFFILEPRE, NULL, NULL, FALSE, curbuf);
-    (void)setfname(curbuf, (char_u *)_("[Command Line]"), NULL, TRUE);
-    apply_autocmds(EVENT_BUFFILEPOST, NULL, NULL, FALSE, curbuf);
     set_option_value_give_err((char_u *)"bt",
 					    0L, (char_u *)"nofile", OPT_LOCAL);
     curbuf->b_p_ma = TRUE;
diff --git a/src/testdir/test_cmdwin.vim b/src/testdir/test_cmdwin.vim
index 494c8065f..33a266262 100644
--- a/src/testdir/test_cmdwin.vim
+++ b/src/testdir/test_cmdwin.vim
@@ -569,4 +569,18 @@ func Test_cmdwin_interrupted()
   delfunc CheckInterrupted
 endfunc
 
+func Test_cmdwin_existing_bufname()
+  func CheckName()
+    call assert_equal(1, getbufinfo('')[0].command)
+    call assert_equal(0, getbufinfo('[Command Line]')[0].command)
+    call assert_match('#a\s*"\[Command Line\]"', execute('ls'))
+    call assert_match('%a\s*"\[Command Line\]"', execute('ls'))
+  endfunc
+
+  file [Command Line]
+  call feedkeys("q::call CheckName()\<CR>:q\<CR>", 'ntx')
+  0file
+  delfunc CheckName
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index 0fd53b501..fb9c3ded5 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -3158,7 +3158,7 @@ func Test_normal50_commandline()
   CheckFeature cmdline_hist
 
   func! DoTimerWork(id)
-    call assert_equal('[Command Line]', bufname(''))
+    call assert_equal(1, getbufinfo('')[0].command)
 
     " should fail, with E11, but does fail with E23?
     "call feedkeys("\<c-^>", 'tm')
diff --git a/src/version.c b/src/version.c
index 63ef3632f..2a54c4794 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    49,
 /**/
     48,
 /**/