diff --git a/tests/syntax-tests/highlighted/VimL/source.vim b/tests/syntax-tests/highlighted/VimL/source.vim
index a3dbe2d1..37c4e953 100644
--- a/tests/syntax-tests/highlighted/VimL/source.vim
+++ b/tests/syntax-tests/highlighted/VimL/source.vim
@@ -69,6 +69,12 @@
 echo "Hello" isnot "Hello2"
 echo "Hello" =~ "Hello2"
 echo "Hello" !~ "Hello2"
+echo "Hello" !~ "Hello2"
+
+echo "/This/should/not/be/a/regex"
+
+" Error case from issue #1604 (https://github.com/sharkdp/bat/issues/1064)
+set runtimepath=~/foo/bar
 
 let g:dict = {}
 let g:dict.item = ['l1', 'l2']
diff --git a/tests/syntax-tests/source/VimL/source.vim b/tests/syntax-tests/source/VimL/source.vim
index 85e536ab..15cd3a81 100644
--- a/tests/syntax-tests/source/VimL/source.vim
+++ b/tests/syntax-tests/source/VimL/source.vim
@@ -69,6 +69,12 @@ echo "Hello" is "Hello2"
 echo "Hello" isnot "Hello2"
 echo "Hello" =~ "Hello2"
 echo "Hello" !~ "Hello2"
+echo "Hello" !~ "Hello2"
+
+echo "/This/should/not/be/a/regex"
+
+" Error case from issue #1604 (https://github.com/sharkdp/bat/issues/1064)
+set runtimepath=~/foo/bar
 
 let g:dict = {}
 let g:dict.item = ['l1', 'l2']