diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index d74ef90..6d2923c 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2910,7 +2910,14 @@
 			    int	    c = 0;
 
 			    if (!checkforcmd_noparen(&p, "filter", 4)
-						|| *p == NUL || ends_excmd(*p))
+				    || *p == NUL
+				    || (ends_excmd(*p)
+#ifdef FEAT_EVAL
+					// in ":filter #pat# cmd" # does not
+					// start a comment
+				     && (!in_vim9script() || VIM_ISWHITE(p[1]))
+#endif
+				     ))
 				break;
 			    if (*p == '!')
 			    {
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 7a05189..57796b6 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -714,6 +714,16 @@
       assert_match('very specific z3d37dh234 string', Screenline(&lines))
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      edit foobar
+      redir => g:filter_out
+      filter #foobar# ls
+      redir END
+      assert_match('"foobar"', g:filter_out)
+      unlet g:filter_out
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_win_command_modifiers()
diff --git a/src/version.c b/src/version.c
index deefcf0..d7c2d69 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3690,
+/**/
     3689,
 /**/
     3688,