diff --git a/src/testdir/test_substitute.vim b/src/testdir/test_substitute.vim
index 40d0500..7868c90 100644
--- a/src/testdir/test_substitute.vim
+++ b/src/testdir/test_substitute.vim
@@ -235,7 +235,7 @@
 
   call assert_fails('s/FOO/bar/', 'E486:')
   call assert_fails('s/foo/bar/@', 'E488:')
-  call assert_fails('s/\(/bar/', 'E476:')
+  call assert_fails('s/\(/bar/', 'E54:')
   call assert_fails('s afooabara', 'E146:')
   call assert_fails('s\\a', 'E10:')
 
@@ -817,9 +817,9 @@
 func Test_sub_with_no_last_pat()
   let lines =<< trim [SCRIPT]
     call assert_fails('~', 'E33:')
-    call assert_fails('s//abc/g', 'E476:')
-    call assert_fails('s\/bar', 'E476:')
-    call assert_fails('s\&bar&', 'E476:')
+    call assert_fails('s//abc/g', 'E35:')
+    call assert_fails('s\/bar', 'E35:')
+    call assert_fails('s\&bar&', 'E33:')
     call writefile(v:errors, 'Xresult')
     qall!
   [SCRIPT]