diff --git a/tests/make_random_string.hh b/tests/make_random_string.hh
index 6aa4c7a81a..7b6b7d6304 100644
--- a/tests/make_random_string.hh
+++ b/tests/make_random_string.hh
@@ -24,6 +24,7 @@
 #pragma once
 
 #include <seastar/core/sstring.hh>
+#include "seastarx.hh"
 #include <random>
 
 inline