diff --git a/src/filepath.c b/src/filepath.c
index a1e281b..d4592eb 100644
--- a/src/filepath.c
+++ b/src/filepath.c
@@ -1493,6 +1493,12 @@
     if (eval_expr_typval(expr, argv, 1, &rettv) == FAIL)
 	goto theend;
 
+    // We want to use -1, but also true/false should be allowed.
+    if (rettv.v_type == VAR_SPECIAL || rettv.v_type == VAR_BOOL)
+    {
+	rettv.v_type = VAR_NUMBER;
+	rettv.vval.v_number = rettv.vval.v_number == VVAL_TRUE;
+    }
     retval = tv_get_number_chk(&rettv, &error);
     if (error)
 	retval = -1;
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 79fd80a..751cd6d 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1386,6 +1386,10 @@
   assert_equal(2, search('bar', 'W', 0, 0, {-> val == 1}))
 enddef
 
+def Test_readdirex()
+   eval expand('.')->readdirex({e -> e.name[0] !=# '.'})
+enddef
+
 def Fibonacci(n: number): number
   if n < 2
     return n
diff --git a/src/version.c b/src/version.c
index 80f464a..3c1eb1c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1485,
+/**/
     1484,
 /**/
     1483,