diff --git a/Cargo.lock b/Cargo.lock
index 179e7109d5d..88bbbeca206 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4562,6 +4562,7 @@ dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.25.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.19.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_size_of 0.0.1",
  "malloc_size_of_derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.21.0",