diff --git a/src/alert.cpp b/src/alert.cpp
index 46e861be9..99164d63e 100644
--- a/src/alert.cpp
+++ b/src/alert.cpp
@@ -10,6 +10,7 @@
 #include "ui_interface.h"
 #include "util.h"
 
+#include <stdint.h>
 #include <algorithm>
 #include <map>