diff --git a/src/evalvars.c b/src/evalvars.c
index 71cab0a..f5761f9 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -4012,10 +4012,12 @@
 {
     // Allow for w: b: s: and t:.  In Vim9 script s: is not allowed, because
     // the name can be used without the s: prefix.
+    // Allow autoload variable.
     if (!((vim_strchr((char_u *)"wbt", name[0]) != NULL
 		    || (!in_vim9script() && name[0] == 's')) && name[1] == ':')
 	    && !ASCII_ISUPPER((name[0] != NUL && name[1] == ':')
-						     ? name[2] : name[0]))
+						     ? name[2] : name[0])
+	    && vim_strchr(name, '#') == NULL)
     {
 	semsg(_(e_funcref_variable_name_must_start_with_capital_str), name);
 	return TRUE;
diff --git a/src/testdir/test_let.vim b/src/testdir/test_let.vim
index fb315e8..9822e6f 100644
--- a/src/testdir/test_let.vim
+++ b/src/testdir/test_let.vim
@@ -8,6 +8,10 @@
   let Test104#numvar = function('tr')
   call assert_equal("function('tr')", string(Test104#numvar))
 
+  let foo#tr = function('tr')
+  call assert_equal("function('tr')", string(foo#tr))
+  unlet foo#tr
+
   let a = 1
   let b = 2
 
diff --git a/src/version.c b/src/version.c
index 2009980..356ac77 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    355,
+/**/
     354,
 /**/
     353,