diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index cdb925ff5eb..2b44bbd8465 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -80,7 +80,7 @@ websocket = "0.12"
 uuid = "0.1.16"
 smallvec = "0.1"
 html5ever = "0.2"
-string_cache = "0.1"
+string_cache = { version = "0.1.9", features = ["unstable"] }
 string_cache_plugin = "0.1"
 euclid = "0.1"
 tendril = "0.1.1"
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index f9f7cac3336..c7af2a1ca88 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -1304,6 +1304,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache_plugin 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache_shared 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index f040ba33a6d..ca959f7b408 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -1301,6 +1301,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache_plugin 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache_shared 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index edb65650242..7af5c61412f 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -1199,6 +1199,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache_plugin 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache_shared 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]