diff --git a/src/eval.c b/src/eval.c
index 4537562..db6ef9d 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -23455,7 +23455,8 @@
 	else
 	    arg = fudi.fd_newkey;
 	if (arg != NULL && (fudi.fd_di == NULL
-				     || fudi.fd_di->di_tv.v_type != VAR_FUNC))
+				     || (fudi.fd_di->di_tv.v_type != VAR_FUNC
+				 && fudi.fd_di->di_tv.v_type != VAR_PARTIAL)))
 	{
 	    if (*arg == K_SPECIAL)
 		j = 3;
diff --git a/src/testdir/test_partial.vim b/src/testdir/test_partial.vim
index 75cc492..1fe67ea 100644
--- a/src/testdir/test_partial.vim
+++ b/src/testdir/test_partial.vim
@@ -193,3 +193,16 @@
     call assert_true(v:false, v:exception)
   endtry
 endfunc
+
+func Test_redefine_dict_func()
+  let d = {}
+  function d.test4()
+  endfunction
+  let d.test4 = d.test4
+  try
+    function! d.test4(name)
+    endfunction
+  catch
+    call assert_true(v:errmsg, v:exception)
+  endtry
+endfunc
diff --git a/src/version.c b/src/version.c
index b90a0d0..dd9b5c2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1645,
+/**/
     1644,
 /**/
     1643,