diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index bc65bb1..c7a968e 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -739,6 +739,19 @@
         'x = filter(["bbb"], (_, v) => v =~ x)'])
 enddef
 
+def Test_pass_legacy_lambda_to_def_func()
+  var lines =<< trim END
+      vim9script
+      func Foo()
+        eval s:Bar({x -> 0})
+      endfunc
+      def Bar(y: any)
+      enddef
+      Foo()
+  END
+  CheckScriptSuccess(lines)
+enddef
+
 " Default arg and varargs
 def MyDefVarargs(one: string, two = 'foo', ...rest: list<string>): string
   var res = one .. ',' .. two
diff --git a/src/version.c b/src/version.c
index 58908cd..4036e2e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2572,
+/**/
     2571,
 /**/
     2570,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index f7bdf31..f6d1fb3 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -274,7 +274,7 @@
  * Lookup a script-local variable in the current script, possibly defined in a
  * block that contains the function "cctx->ctx_ufunc".
  * "cctx" is NULL at the script level.
- * if "len" is <= 0 "name" must be NUL terminated.
+ * If "len" is <= 0 "name" must be NUL terminated.
  * Return NULL when not found.
  */
     static sallvar_T *
@@ -8730,6 +8730,8 @@
     // The type is included in "tt_args".
     if (argcount > 0 || varargs)
     {
+	if (ufunc->uf_type_list.ga_itemsize == 0)
+	    ga_init2(&ufunc->uf_type_list, sizeof(type_T *), 10);
 	ufunc->uf_func_type = alloc_func_type(ufunc->uf_ret_type,
 					   argcount, &ufunc->uf_type_list);
 	// Add argument types to the function type.