Index: libcxx/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
===================================================================
--- libcxx/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
+++ libcxx/test/std/thread/thread.condition/thread.condition.condvar/default.pass.cpp
@@ -22,6 +22,7 @@
 int main(int, char**)
 {
     std::condition_variable cv;
+    static_cast<void>(cv);
 
   return 0;
 }