diff --git a/libfsst.hpp b/libfsst.hpp
index 6a38ab4..d5ffcb8 100644
--- a/libfsst.hpp
+++ b/libfsst.hpp
@@ -17,6 +17,7 @@
 // You can contact the authors via the FSST source repository : https://github.com/cwida/fsst 
 #include <algorithm>
 #include <cassert>
+#include <cstdint>
 #include <cstring>
 #include <fstream>
 #include <iostream>
diff --git a/libfsst12.hpp b/libfsst12.hpp
index 6a88941..0093a2e 100644
--- a/libfsst12.hpp
+++ b/libfsst12.hpp
@@ -17,6 +17,7 @@
 // You can contact the authors via the FSST source repository : https://github.com/cwida/fsst 
 #include <algorithm>
 #include <cassert>
+#include <cstdint>
 #include <cstring>
 #include <fstream>
 #include <iostream>