diff --git a/crates/redos/src/lib.rs b/crates/redos/src/lib.rs
index 9eef1d1..149748f 100644
--- a/crates/redos/src/lib.rs
+++ b/crates/redos/src/lib.rs
@@ -29,6 +29,7 @@ fn repeats_anywhere(expr: &Expr, config: &VulnerabilityConfig) -> bool {
         Expr::Group(e) => repeats_anywhere(e.as_ref(), config),
         Expr::LookAround(e, _) => repeats_anywhere(e.as_ref(), config),
         Expr::AtomicGroup(e) => repeats_anywhere(e.as_ref(), config),
+        Expr::Optional(e) => repeats_anywhere(e.as_ref(), config),
         Expr::Conditional {
             condition,
             true_branch,