diff --git a/src/testdir/test_lua.vim b/src/testdir/test_lua.vim
index 38ff872..136649e 100644
--- a/src/testdir/test_lua.vim
+++ b/src/testdir/test_lua.vim
@@ -184,7 +184,7 @@
   call assert_fails("call luaeval('vim.call(\"type\", co)')",
         \ '[string "luaeval"]:1: lua: cannot convert value')
   lua co = nil
-  call assert_fails("call luaeval('vim.call(\"abc\")')", '[string "luaeval"]:1: lua: call_vim_function failed')
+  call assert_fails("call luaeval('vim.call(\"abc\")')", ['E117:', '\[string "luaeval"]:1: lua: call_vim_function failed'])
 endfunc
 
 " Test vim.fn.*
@@ -637,7 +637,7 @@
   call assert_fails('lua f1 = vim.funcref(fname)',
         \ "[string \"vim chunk\"]:1: bad argument #1 to 'funcref' (string expected, got nil)")
   call assert_fails('lua vim.funcref("abc")()',
-        \ '[string "vim chunk"]:1: cannot call funcref')
+        \ ['E117:', '\[string "vim chunk"]:1: cannot call funcref'])
 
   " dict funcref
   function Mylen() dict
diff --git a/src/testdir/test_tcl.vim b/src/testdir/test_tcl.vim
index d6b03eb..b851ce8 100644
--- a/src/testdir/test_tcl.vim
+++ b/src/testdir/test_tcl.vim
@@ -27,7 +27,8 @@
   " Try to run a command in a 'nomodifiable' buffer
   call setline(1, ['one', 'two', 'three'])
   set nomodifiable
-  call assert_fails('tcldo set line "abc"', 'cannot save undo information')
+  call assert_fails('tcldo set line "abc"',
+        \ ['E21:', 'cannot save undo information'])
   set modifiable
 
   %bwipe!
@@ -449,7 +450,7 @@
   " Try to delete lines from an 'nomodifiable' buffer
   set nomodifiable
   call assert_fails('tcl $::vim::current(buffer) delete 2 1',
-        \ 'cannot save undo information')
+        \ ['E21:', 'cannot save undo information'])
   set modifiable
 
   bwipe!
@@ -495,7 +496,7 @@
   " Try to append lines to a 'nomodifiable' buffer
   set nomodifiable
   call assert_fails('tcl $buf append 1 "first"',
-        \ 'cannot save undo information')
+        \ ['E21:', 'cannot save undo information'])
   set modifiable
 
   tcl unset buf
@@ -531,11 +532,11 @@
   " Try to modify a 'nomodifiable' buffer
   set nomodifiable
   call assert_fails('tcl $::vim::current(buffer) set 1 "x"',
-        \ 'cannot save undo information')
+        \ ['E21:', 'cannot save undo information'])
   call assert_fails('tcl $::vim::current(buffer) set 1 {a b}',
-        \ 'cannot save undo information')
+        \ ['E21:', 'cannot save undo information'])
   call assert_fails('tcl $::vim::current(buffer) set 1 2 {a b}',
-        \ 'cannot save undo information')
+        \ ['E21:', 'cannot save undo information'])
   set modifiable
   bwipe!
 endfunc