diff --git a/Cargo.toml b/Cargo.toml
index 16fc62e..54ec981 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,5 +19,6 @@ serde = "1.0.80"
 lazy_static = "1.1.0"
 log = "0.4.5"
 linked_hash_set = "0.1.3"
+bitflags = "1.0.4"
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.6", features = ["minwindef", "windef", "winuser"] }