diff --git a/src/os/unix/mod.rs b/src/os/unix/mod.rs
index b06e716..16a5ac6 100644
--- a/src/os/unix/mod.rs
+++ b/src/os/unix/mod.rs
@@ -55,6 +55,8 @@ pub struct Library {
     handle: *mut raw::c_void
 }
 
+unsafe impl ::std::marker::Send for Library {}
+
 impl Library {
     fn open<P>(filename: Option<P>, flags: raw::c_int) -> ::Result<Library>
     where P: AsRef<OsStr> {
diff --git a/src/os/windows/mod.rs b/src/os/windows/mod.rs
index f99157c..5c882e4 100644
--- a/src/os/windows/mod.rs
+++ b/src/os/windows/mod.rs
@@ -15,6 +15,10 @@ use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
 /// A platform-specific equivalent of the cross-platform `Library`.
 pub struct Library(winapi::HMODULE);
 
+// There’s little documentation on Send-ability of HMODULE, but lack of warnings on the MSDN page
+// and reading http://stackoverflow.com/a/11254061, it seems like it should be fine?
+unsafe impl ::std::marker::Send for Library {}
+
 impl Library {
     /// Find and load a shared library (module).
     ///