diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 128575b..93b1295 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -537,7 +537,7 @@
   CheckDefAndScriptSuccess(lines)
 enddef
 
-def Test_register_use_linebreak()
+def Test_use_register()
   var lines =<< trim END
       new
       @a = 'one'
@@ -551,6 +551,12 @@
       bwipe!
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      @a = 'echo "text"'
+      @a
+  END
+  CheckDefAndScriptFailure(lines, 'E1207:')
 enddef
 
 def Test_environment_use_linebreak()