diff --git a/src/libstd/sys/common/net.rs b/src/libstd/sys/common/net.rs
index 68d5f49dffac4..67e1099c29540 100644
--- a/src/libstd/sys/common/net.rs
+++ b/src/libstd/sys/common/net.rs
@@ -110,6 +110,9 @@ impl Iterator for LookupHost {
     }
 }
 
+unsafe impl Sync for LookupHost {}
+unsafe impl Send for LookupHost {}
+
 impl Drop for LookupHost {
     fn drop(&mut self) {
         unsafe { freeaddrinfo(self.original) }