diff --git a/src/tools/rustc-workspace-hack/Cargo.toml b/src/tools/rustc-workspace-hack/Cargo.toml
index e8e812e70faa..77ffe41d7f67 100644
--- a/src/tools/rustc-workspace-hack/Cargo.toml
+++ b/src/tools/rustc-workspace-hack/Cargo.toml
@@ -50,4 +50,8 @@ features = [
 
 [dependencies.serde_json]
 version = "1.0.31"
-features = ["raw_value"]
\ No newline at end of file
+features = ["raw_value"]
+
+[dependencies.rand]
+version = "0.5.5"
+features = ["i128_support"]