diff --git a/src/test/protocol/STIssue_test.cpp b/src/test/protocol/STIssue_test.cpp
index 85a7351f0e..46203e3b92 100644
--- a/src/test/protocol/STIssue_test.cpp
+++ b/src/test/protocol/STIssue_test.cpp
@@ -14,6 +14,8 @@
 #include <xrpl/protocol/Serializer.h>
 #include <xrpl/protocol/UintTypes.h>
 
+#include <cstdint>
+
 namespace xrpl::test {
 
 class STIssue_test : public beast::unit_test::Suite