diff --git a/src/change.c b/src/change.c
index 7796d29..dc68d3c 100644
--- a/src/change.c
+++ b/src/change.c
@@ -259,6 +259,8 @@
     buf->b_listener = lnr;
 
     set_callback(&lnr->lr_callback, &callback);
+    if (callback.cb_free_name)
+	vim_free(callback.cb_name);
 
     lnr->lr_id = ++next_listener_id;
     rettv->vval.v_number = lnr->lr_id;
diff --git a/src/evalvars.c b/src/evalvars.c
index 20223c8..31cc760 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -4792,9 +4792,9 @@
 
 /*
  * Get a callback from "arg".  It can be a Funcref or a function name.
- * When "arg" is zero return an empty string.
- * "cb_name" is not allocated.
- * "cb_name" is set to NULL for an invalid argument.
+ * When "arg" is zero "res.cb_name" is set to an empty string.
+ * If "res.cb_name" is allocated then "res.cb_free_name" is set to TRUE.
+ * "res.cb_name" is set to NULL for an invalid argument.
  */
     callback_T
 get_callback(typval_T *arg)
@@ -4802,7 +4802,7 @@
     callback_T  res;
     int		r = OK;
 
-    res.cb_free_name = FALSE;
+    CLEAR_FIELD(res);
     if (arg->v_type == VAR_PARTIAL && arg->vval.v_partial != NULL)
     {
 	res.cb_partial = arg->vval.v_partial;
@@ -4811,25 +4811,21 @@
     }
     else
     {
-	res.cb_partial = NULL;
 	if (arg->v_type == VAR_STRING && arg->vval.v_string != NULL
 					       && isdigit(*arg->vval.v_string))
 	    r = FAIL;
 	else if (arg->v_type == VAR_FUNC || arg->v_type == VAR_STRING)
 	{
+	    res.cb_name = arg->vval.v_string;
 	    if (arg->v_type == VAR_STRING)
 	    {
-		char_u *name;
-
-		name = get_scriptlocal_funcname(arg->vval.v_string);
+		char_u *name = get_scriptlocal_funcname(arg->vval.v_string);
 		if (name != NULL)
 		{
-		    vim_free(arg->vval.v_string);
-		    arg->vval.v_string = name;
+		    res.cb_name = name;
+		    res.cb_free_name = TRUE;
 		}
 	    }
-
-	    res.cb_name = arg->vval.v_string;
 	    func_ref(res.cb_name);
 	}
 	else if (arg->v_type == VAR_NUMBER && arg->vval.v_number == 0)
diff --git a/src/job.c b/src/job.c
index 259d49c..ba5eec0 100644
--- a/src/job.c
+++ b/src/job.c
@@ -74,32 +74,31 @@
     CLEAR_POINTER(opt);
 }
 
+    static void
+unref_job_callback(callback_T *cb)
+{
+    if (cb->cb_partial != NULL)
+	partial_unref(cb->cb_partial);
+    else if (cb->cb_name != NULL)
+    {
+	func_unref(cb->cb_name);
+	if (cb->cb_free_name)
+	    vim_free(cb->cb_name);
+    }
+}
+
 /*
  * Free any members of a jobopt_T.
  */
     void
 free_job_options(jobopt_T *opt)
 {
-    if (opt->jo_callback.cb_partial != NULL)
-	partial_unref(opt->jo_callback.cb_partial);
-    else if (opt->jo_callback.cb_name != NULL)
-	func_unref(opt->jo_callback.cb_name);
-    if (opt->jo_out_cb.cb_partial != NULL)
-	partial_unref(opt->jo_out_cb.cb_partial);
-    else if (opt->jo_out_cb.cb_name != NULL)
-	func_unref(opt->jo_out_cb.cb_name);
-    if (opt->jo_err_cb.cb_partial != NULL)
-	partial_unref(opt->jo_err_cb.cb_partial);
-    else if (opt->jo_err_cb.cb_name != NULL)
-	func_unref(opt->jo_err_cb.cb_name);
-    if (opt->jo_close_cb.cb_partial != NULL)
-	partial_unref(opt->jo_close_cb.cb_partial);
-    else if (opt->jo_close_cb.cb_name != NULL)
-	func_unref(opt->jo_close_cb.cb_name);
-    if (opt->jo_exit_cb.cb_partial != NULL)
-	partial_unref(opt->jo_exit_cb.cb_partial);
-    else if (opt->jo_exit_cb.cb_name != NULL)
-	func_unref(opt->jo_exit_cb.cb_name);
+    unref_job_callback(&opt->jo_callback);
+    unref_job_callback(&opt->jo_out_cb);
+    unref_job_callback(&opt->jo_err_cb);
+    unref_job_callback(&opt->jo_close_cb);
+    unref_job_callback(&opt->jo_exit_cb);
+
     if (opt->jo_env != NULL)
 	dict_unref(opt->jo_env);
 }
@@ -1687,6 +1686,8 @@
 
     free_callback(&buf->b_prompt_callback);
     set_callback(&buf->b_prompt_callback, &callback);
+    if (callback.cb_free_name)
+	vim_free(callback.cb_name);
 }
 
 /*
@@ -1714,6 +1715,8 @@
 
     free_callback(&buf->b_prompt_interrupt);
     set_callback(&buf->b_prompt_interrupt, &callback);
+    if (callback.cb_free_name)
+	vim_free(callback.cb_name);
 }
 
 
diff --git a/src/option.c b/src/option.c
index 816837d..07a9e52 100644
--- a/src/option.c
+++ b/src/option.c
@@ -7370,6 +7370,8 @@
 
     free_callback(optcb);
     set_callback(optcb, &cb);
+    if (cb.cb_free_name)
+	vim_free(cb.cb_name);
     free_tv(tv);
 
     // when using Vim9 style "import.funcname" it needs to be expanded to
diff --git a/src/popupwin.c b/src/popupwin.c
index 9bc3174..e487f0c 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -444,7 +444,13 @@
     if (get_lambda_tv_and_compile(&ptr, &tv, FALSE, &EVALARG_EVALUATE) == OK)
     {
 	wp->w_popup_timer = create_timer(time, 0);
-	wp->w_popup_timer->tr_callback = get_callback(&tv);
+	callback_T cb = get_callback(&tv);
+	if (cb.cb_name != NULL && !cb.cb_free_name)
+	{
+	    cb.cb_name = vim_strsave(cb.cb_name);
+	    cb.cb_free_name = TRUE;
+	}
+	wp->w_popup_timer->tr_callback = cb;
 	clear_tv(&tv);
     }
 }
@@ -961,6 +967,8 @@
 	{
 	    free_callback(&wp->w_filter_cb);
 	    set_callback(&wp->w_filter_cb, &callback);
+	    if (callback.cb_free_name)
+		vim_free(callback.cb_name);
 	}
     }
     nr = dict_get_bool(dict, "mapping", -1);
@@ -990,6 +998,8 @@
 	{
 	    free_callback(&wp->w_close_cb);
 	    set_callback(&wp->w_close_cb, &callback);
+	    if (callback.cb_free_name)
+		vim_free(callback.cb_name);
 	}
     }
 }
@@ -2229,7 +2239,11 @@
 	tv.vval.v_string = (char_u *)"popup_filter_menu";
 	callback = get_callback(&tv);
 	if (callback.cb_name != NULL)
+	{
 	    set_callback(&wp->w_filter_cb, &callback);
+	    if (callback.cb_free_name)
+		vim_free(callback.cb_name);
+	}
 
 	wp->w_p_wrap = 0;
 	wp->w_popup_flags |= POPF_CURSORLINE;
diff --git a/src/quickfix.c b/src/quickfix.c
index 4c414e0..ca5b356 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -7633,7 +7633,11 @@
     free_callback(&qfl->qf_qftf_cb);
     cb = get_callback(&di->di_tv);
     if (cb.cb_name != NULL && *cb.cb_name != NUL)
+    {
 	set_callback(&qfl->qf_qftf_cb, &cb);
+	if (cb.cb_free_name)
+	    vim_free(cb.cb_name);
+    }
 
     return OK;
 }
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index e82e647..1620db5 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -6387,5 +6387,17 @@
   call setqflist([], 'f')
 endfunc
 
+func s:QfTf(_)
+endfunc
+
+func Test_setqflist_cb_arg()
+  " This was changing the callback name in the dictionary.
+  let d = #{quickfixtextfunc: 's:QfTf'}
+  call setqflist([], 'a', d)
+  call assert_equal('s:QfTf', d.quickfixtextfunc)
+
+  call setqflist([], 'f')
+endfunc
+
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/time.c b/src/time.c
index 891a9f4..efdad69 100644
--- a/src/time.c
+++ b/src/time.c
@@ -908,6 +908,8 @@
     else
     {
 	set_callback(&timer->tr_callback, &callback);
+	if (callback.cb_free_name)
+	    vim_free(callback.cb_name);
 	rettv->vval.v_number = (varnumber_T)timer->tr_id;
     }
 }
diff --git a/src/version.c b/src/version.c
index 6583d46..f9b1e6c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    990,
+/**/
     989,
 /**/
     988,