diff --git a/external/mdal/3rdparty/textio.h b/external/mdal/3rdparty/textio.h
index 4e1547dca92..d9453af098c 100644
--- a/external/mdal/3rdparty/textio.h
+++ b/external/mdal/3rdparty/textio.h
@@ -53,6 +53,7 @@ SOFTWARE.
 #include <cmath>
 #include <cstring>
 #include <iostream>
+#include <cstdint>
 
 namespace textio
 {
diff --git a/external/mdal/mdal_datetime.hpp b/external/mdal/mdal_datetime.hpp
index fafec38616d..7eb7f5e9d96 100644
--- a/external/mdal/mdal_datetime.hpp
+++ b/external/mdal/mdal_datetime.hpp
@@ -8,6 +8,7 @@
 
 #include <string>
 #include <vector>
+#include <cstdint>
 
 #include "mdal.h"