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-rw-r--r--src/libstd/sys/common/helper_thread.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sys/common/helper_thread.rs b/src/libstd/sys/common/helper_thread.rs
index 53f18a57325..10077dfd1b8 100644
--- a/src/libstd/sys/common/helper_thread.rs
+++ b/src/libstd/sys/common/helper_thread.rs
@@ -38,7 +38,7 @@ use thread;
 ///
 /// The fields of this helper are all public, but they should not be used, this
 /// is for static initialization.
-pub struct Helper<M> {
+pub struct Helper<M:Send> {
     /// Internal lock which protects the remaining fields
     pub lock: StaticMutex,
     pub cond: StaticCondvar,