--- a/folly/concurrency/test/AtomicSharedPtrTest.cpp
+++ b/folly/concurrency/test/AtomicSharedPtrTest.cpp
@@ -27,6 +27,7 @@
 #include <folly/concurrency/AtomicSharedPtr.h>
 #include <folly/concurrency/test/AtomicSharedPtrCounted.h>
 #include <folly/portability/GTest.h>
+#include <folly/portability/GFlags.h>

 #include <folly/test/DeterministicSchedule.h>