diff --git a/src/test/protocol/STNumber_test.cpp b/src/test/protocol/STNumber_test.cpp
index 0466616632..1e5027df49 100644
--- a/src/test/protocol/STNumber_test.cpp
+++ b/src/test/protocol/STNumber_test.cpp
@@ -12,6 +12,7 @@
 #include <exception>
 #include <initializer_list>
 #include <limits>
+#include <sstream>
 #include <stdexcept>
 #include <string>
 #include <type_traits>
diff --git a/src/tests/libxrpl/basics/Number.cpp b/src/tests/libxrpl/basics/Number.cpp
index 946edf56e3..a99fdf62d1 100644
--- a/src/tests/libxrpl/basics/Number.cpp
+++ b/src/tests/libxrpl/basics/Number.cpp
@@ -1,5 +1,6 @@
 #include <xrpl/basics/Number.h>
 
+#include <xrpl/beast/utility/Zero.h>
 #include <xrpl/protocol/IOUAmount.h>
 #include <xrpl/protocol/Issue.h>
 #include <xrpl/protocol/STAmount.h>