diff --git a/src/testdir/test_substitute.vim b/src/testdir/test_substitute.vim
index b99d0e0..3ed1597 100644
--- a/src/testdir/test_substitute.vim
+++ b/src/testdir/test_substitute.vim
@@ -206,6 +206,7 @@
   call assert_equal(['foo foo', 'foo foo', 'foo foo', 'bar foo', 'bar foo'],
         \           getline(1, '$'))
 
+  call assert_fails('s/./b/2147483647', 'E1510:')
   bwipe!
 endfunc