diff --git a/src/evalfunc.c b/src/evalfunc.c
index ac75a7d..110935d 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -1710,7 +1710,7 @@
 	int	utf8 = 0;
 
 	if (argvars[1].v_type != VAR_UNKNOWN)
-	    utf8 = (int)tv_get_number_chk(&argvars[1], NULL);
+	    utf8 = (int)tv_get_bool_chk(&argvars[1], NULL);
 
 	if (utf8)
 	    rettv->vval.v_number = utf_ptr2char(tv_get_string(&argvars[0]));
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index ad3268a..3e21730 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1339,6 +1339,10 @@
   assert_equal(5, col([1, '$']))
 enddef
 
+def Test_char2nr()
+  assert_equal(12354, char2nr('あ', true))
+enddef
+
 def Test_getreg_return_type()
   let s1: string = getreg('"')
   let s2: string = getreg('"', 1)
diff --git a/src/version.c b/src/version.c
index 60c6294..111405f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1592,
+/**/
     1591,
 /**/
     1590,