diff --git a/Cargo.toml b/Cargo.toml
index 11236d328..0643972ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ path = "src/cargo/lib.rs"
 atty = "0.2"
 bytesize = "1.0"
 crates-io = { path = "src/crates-io", version = "0.21" }
-crossbeam-utils = "0.5"
+crossbeam-utils = "0.6"
 crypto-hash = "0.3.1"
 curl = { version = "0.4.19", features = ['http2'] }
 curl-sys = "0.4.15"
diff --git a/src/cargo/core/compiler/job_queue.rs b/src/cargo/core/compiler/job_queue.rs
index f97c7421a..806412bcd 100644
--- a/src/cargo/core/compiler/job_queue.rs
+++ b/src/cargo/core/compiler/job_queue.rs
@@ -201,7 +201,9 @@ impl<'a> JobQueue<'a> {
                 srv.start(move |msg| drop(tx2.send(Message::FixDiagnostic(msg))))
             });
 
-        crossbeam_utils::thread::scope(|scope| self.drain_the_queue(cx, plan, scope, &helper))
+        crossbeam_utils::thread::scope(|scope| {
+            self.drain_the_queue(cx, plan, scope, &helper)
+        }).expect("child threads should't panic")
     }
 
     fn drain_the_queue(
@@ -409,7 +411,7 @@ impl<'a> JobQueue<'a> {
         match fresh {
             Freshness::Fresh => doit(),
             Freshness::Dirty => {
-                scope.spawn(doit);
+                scope.spawn(move |_| doit());
             }
         }