diff --git a/src/test/basics/Number_test.cpp b/src/test/basics/Number_test.cpp
index 5bbdc1c798..f4bd1c9d66 100644
--- a/src/test/basics/Number_test.cpp
+++ b/src/test/basics/Number_test.cpp
@@ -22,6 +22,7 @@
 #include <string>
 #include <tuple>
 #include <utility>
+#include <vector>
 
 namespace xrpl {