diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 6d83ddc..3fa5d6a 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -260,6 +260,16 @@
   assert_equal(3, g:SomeFunc('abc'))
   assert_fails('NotAFunc()', 'E117:')
   assert_fails('g:NotAFunc()', 'E117:')
+
+  let lines =<< trim END
+    vim9script
+    def RetNumber(): number
+      return 123
+    enddef
+    let Funcref: func: number = function('RetNumber')
+    assert_equal(123, Funcref())
+  END
+  CheckScriptSuccess(lines)
 enddef
 
 let SomeFunc = function('len')