diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp
index 1797e19c549cf..072a9144f17a1 100644
--- a/src/rustllvm/PassWrapper.cpp
+++ b/src/rustllvm/PassWrapper.cpp
@@ -970,7 +970,7 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
   std::set<GlobalValue::GUID> ExportedGUIDs;
   for (auto &List : Ret->Index) {
     for (auto &GVS: List.second) {
-      if (!GlobalValue::isExternalLinkage(GVS->linkage()))
+      if (GlobalValue::isLocalLinkage(GVS->linkage()))
         continue;
       auto GUID = GVS->getOriginalName();
       if (!DeadSymbols.count(GUID))
diff --git a/src/test/run-pass/thinlto/weak-works.rs b/src/test/run-pass/thinlto/weak-works.rs
new file mode 100644
index 0000000000000..b9719e04f3447
--- /dev/null
+++ b/src/test/run-pass/thinlto/weak-works.rs
@@ -0,0 +1,37 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -C codegen-units=8 -Z thinlto
+// ignore-windows
+// min-llvm-version 4.0
+
+#![feature(linkage)]
+
+pub mod foo {
+    #[linkage = "weak"]
+    #[no_mangle]
+    pub extern "C" fn FOO() -> i32 {
+        0
+    }
+}
+
+mod bar {
+    extern "C" {
+        fn FOO() -> i32;
+    }
+
+    pub fn bar() -> i32 {
+        unsafe { FOO() }
+    }
+}
+
+fn main() {
+    bar::bar();
+}