diff --git a/test/hotspot/gtest/gc/shared/test_memset_with_concurrent_readers.cpp b/test/hotspot/gtest/gc/shared/test_memset_with_concurrent_readers.cpp
index 7a3845e336a3130fc853f3719e43628d059a7131..523e862ce14c187b685df7f4e0b5eaa55f004893 100644
--- a/test/hotspot/gtest/gc/shared/test_memset_with_concurrent_readers.cpp
+++ b/test/hotspot/gtest/gc/shared/test_memset_with_concurrent_readers.cpp
@@ -28,6 +28,7 @@
 #include "utilities/vmassert_uninstall.hpp"
 #include <string.h>
 #include <sstream>
+#include <iomanip>
 #include "utilities/vmassert_reinstall.hpp"
 
 #include "unittest.hpp"