diff --git a/.gitattributes b/.gitattributes
index 9d0ac53655..1d9bcbc9b8 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -11909,6 +11909,7 @@ tests/webtbs/tw2028.pp svneol=native#text/plain
 tests/webtbs/tw2030.pp svneol=native#text/plain
 tests/webtbs/tw2031.pp svneol=native#text/plain
 tests/webtbs/tw2037.pp svneol=native#text/plain
+tests/webtbs/tw20396.pp svneol=native#text/plain
 tests/webtbs/tw2040.pp svneol=native#text/plain
 tests/webtbs/tw2041.pp svneol=native#text/plain
 tests/webtbs/tw20421.pp svneol=native#text/pascal
diff --git a/tests/webtbs/tw20396.pp b/tests/webtbs/tw20396.pp
new file mode 100644
index 0000000000..0f6eba431a
--- /dev/null
+++ b/tests/webtbs/tw20396.pp
@@ -0,0 +1,11 @@
+{ %opt=-Co }
+program test_Co_option;
+
+{$mode objfpc}{$H+}
+var i: Integer;
+
+begin
+  i := -2;
+  i := i * 2;
+  writeln('ok');
+end.