diff --git a/include/kafka/addons/KafkaMetrics.h b/include/kafka/addons/KafkaMetrics.h
index 96fe3ce3..400f8da4 100644
--- a/include/kafka/addons/KafkaMetrics.h
+++ b/include/kafka/addons/KafkaMetrics.h
@@ -8,6 +8,7 @@
 #include <rapidjson/writer.h>
 
 #include <algorithm>
+#include <cstdint>
 #include <iostream>
 #include <sstream>
 #include <stdexcept>