diff --git a/src/tex2lyx/Parser.cpp b/src/tex2lyx/Parser.cpp
index e4eb9b40ba..2fd17890a9 100644
--- a/src/tex2lyx/Parser.cpp
+++ b/src/tex2lyx/Parser.cpp
@@ -16,6 +16,7 @@
 #include "support/lstrings.h"
 #include "support/textutils.h"
 
+#include <cstdint>
 #include <iostream>
 
 using namespace std;