diff --git a/Cargo.lock b/Cargo.lock
index ce4e3ce8b6f..b2805f26015 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2458,6 +2458,7 @@ dependencies = [
  "keyboard-types 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout_thread 0.0.1",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mozangle 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net 0.0.1",
  "net_traits 0.0.1",
@@ -3945,7 +3946,6 @@ dependencies = [
  "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
  "libservo 0.0.1",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "mozangle 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "osmesa-src 0.1.0 (git+https://github.com/servo/osmesa-src)",
  "osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-webvr 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index bbe797bc4f0..554783ef065 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -382,6 +382,7 @@ def windows_unit():
             "mach build --dev",
             "mach test-unit",
             "mach package --dev",
+            "mach build --dev --libsimpleservo",
         )
         .with_artifacts("repo/target/debug/msi/Servo.exe",
                         "repo/target/debug/msi/Servo.zip")