diff --git a/Cargo.lock b/Cargo.lock
index ca029f3bbbb..52ee9fde9ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2924,20 +2924,20 @@ dependencies = [
 [[package]]
 name = "mozjs"
 version = "0.12.1"
-source = "git+https://github.com/servo/rust-mozjs#8e99da18185a92a5c10bc7e4bd5249bb9f9c3d84"
+source = "git+https://github.com/servo/rust-mozjs#2ef1de9a549ac5e1b88aad893567e5f3a6579a99"
 dependencies = [
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "mozjs_sys 0.67.1 (git+https://github.com/servo/mozjs?rev=8e3ac9b0228f9cd92ac2ce718cf1436860f18a8f)",
+ "mozjs_sys 0.67.1 (git+https://github.com/servo/mozjs?rev=dd175ee73a179ce218286c4be4ab80e1a75348be)",
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "mozjs_sys"
 version = "0.67.1"
-source = "git+https://github.com/servo/mozjs?rev=8e3ac9b0228f9cd92ac2ce718cf1436860f18a8f#8e3ac9b0228f9cd92ac2ce718cf1436860f18a8f"
+source = "git+https://github.com/servo/mozjs?rev=dd175ee73a179ce218286c4be4ab80e1a75348be#dd175ee73a179ce218286c4be4ab80e1a75348be"
 dependencies = [
  "bindgen 0.51.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -6095,7 +6095,7 @@ dependencies = [
 "checksum moite_moite 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb5a94c61e12e2cfc16ee3e2b6eca8f126a43c888586626337544a7e824a1af"
 "checksum mozangle 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "75a61b5a06b6f362eb45590ddf2643c255768a7039bcde1dc70320b97e7f9651"
 "checksum mozjs 0.12.1 (git+https://github.com/servo/rust-mozjs)" = "<none>"
-"checksum mozjs_sys 0.67.1 (git+https://github.com/servo/mozjs?rev=8e3ac9b0228f9cd92ac2ce718cf1436860f18a8f)" = "<none>"
+"checksum mozjs_sys 0.67.1 (git+https://github.com/servo/mozjs?rev=dd175ee73a179ce218286c4be4ab80e1a75348be)" = "<none>"
 "checksum msdos_time 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "aad9dfe950c057b1bfe9c1f2aa51583a8468ef2a5baba2ebbe06d775efeb7729"
 "checksum muldiv 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "451a9a05d2a32c566c897835e0ea95cf79ed2fdfe957924045a1721a36c9980f"
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index 5c9fa86e95f..56e37ce17d8 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -20,6 +20,7 @@ default = ["unrooted_must_root_lint"]
 webgl_backtrace = ["backtrace", "canvas_traits/webgl_backtrace"]
 js_backtrace = ["backtrace"]
 uwp = ["js/uwp"]
+vslatestinstalled = ["js/vslatestinstalled"]
 
 [build-dependencies]
 cmake = "0.1"
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index d60ec167d75..84ba5dd825e 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -35,6 +35,7 @@ webgl_backtrace = [
     "canvas/webgl_backtrace",
     "canvas_traits/webgl_backtrace",
 ]
+vslatestinstalled = ["script/vslatestinstalled"]
 
 [dependencies]
 background_hang_monitor = {path = "../background_hang_monitor"}
diff --git a/ports/glutin/Cargo.toml b/ports/glutin/Cargo.toml
index c600856bab7..1c9219b182a 100644
--- a/ports/glutin/Cargo.toml
+++ b/ports/glutin/Cargo.toml
@@ -43,6 +43,7 @@ profilemozjs = ["libservo/profilemozjs"]
 webdriver = ["libservo/webdriver"]
 webgl_backtrace = ["libservo/webgl_backtrace"]
 webrender_debugger = ["libservo/webrender_debugger"]
+vslatestinstalled = ["libservo/vslatestinstalled"]
 
 [target.'cfg(not(target_os = "android"))'.dependencies]
 backtrace = "0.3"