diff --git a/src/matrix4.cpp b/src/matrix4.cpp
index b07c743..c855898 100644
--- a/src/matrix4.cpp
+++ b/src/matrix4.cpp
@@ -32,6 +32,7 @@
 #include "../include/hydra.h"
 
 #include <string.h>
+#include <cstdint>
 
 namespace hydra {