diff --git a/src/tools/rustc-workspace-hack/Cargo.toml b/src/tools/rustc-workspace-hack/Cargo.toml
index cbf7d09f2e4..1b1f4447966 100644
--- a/src/tools/rustc-workspace-hack/Cargo.toml
+++ b/src/tools/rustc-workspace-hack/Cargo.toml
@@ -22,6 +22,7 @@ features = [
   "basetsd",
   "consoleapi",
   "errhandlingapi",
+  "fibersapi",
   "ioapiset",
   "jobapi",
   "jobapi2",