diff --git a/src/test/overlay/ProtocolStart_test.cpp b/src/test/overlay/ProtocolStart_test.cpp
index 57da6173c23..e4976d16f33 100644
--- a/src/test/overlay/ProtocolStart_test.cpp
+++ b/src/test/overlay/ProtocolStart_test.cpp
@@ -16,6 +16,7 @@
     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 //==============================================================================
+#include <ripple/basics/random.h>
 #include <ripple/core/Config.h>
 #include <ripple/core/ConfigSections.h>
 #include <ripple/overlay/Overlay.h>