diff --git a/tests/perf.cc b/tests/perf.cc
index 469d2da..aa85eb2 100644
--- a/tests/perf.cc
+++ b/tests/perf.cc
@@ -1,3 +1,4 @@
+#include <cstdint>
 #include <cstdlib>
 #include <iostream>
 #include <fstream>