diff --git a/Cargo.lock b/Cargo.lock
index f2c834d142fba..17378cb4a2d07 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3571,6 +3571,7 @@ dependencies = [
 name = "rustc-workspace-hack"
 version = "1.0.0"
 dependencies = [
+ "bstr",
  "byteorder",
  "crossbeam-utils 0.8.3",
  "libc",
diff --git a/src/tools/rustc-workspace-hack/Cargo.toml b/src/tools/rustc-workspace-hack/Cargo.toml
index d39cb597b21c8..4a4b26da54caf 100644
--- a/src/tools/rustc-workspace-hack/Cargo.toml
+++ b/src/tools/rustc-workspace-hack/Cargo.toml
@@ -61,6 +61,7 @@ features = [
 ]
 
 [dependencies]
+bstr = { version = "0.2.13", features = ["default"] }
 byteorder = { version = "1", features = ['default', 'std'] }
 curl-sys = { version = "0.4.13", features = ["http2", "libnghttp2-sys"], optional = true }
 crossbeam-utils = { version = "0.8.0", features = ["nightly"] }