diff --git a/ZAPDTR/ZAPD/Declaration.h b/ZAPDTR/ZAPD/Declaration.h
index 45d36f49e..64712d8c3 100644
--- a/ZAPDTR/ZAPD/Declaration.h
+++ b/ZAPDTR/ZAPD/Declaration.h
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <vector>
+#include <cstdint>
 
 // TODO: should we drop the `_t` suffix because of UNIX compliance?
 typedef uint32_t segptr_t;
diff --git a/ZAPDTR/ZAPD/OutputFormatter.h b/ZAPDTR/ZAPD/OutputFormatter.h
index 03abfdb96..391f41027 100644
--- a/ZAPDTR/ZAPD/OutputFormatter.h
+++ b/ZAPDTR/ZAPD/OutputFormatter.h
@@ -3,6 +3,7 @@
 #include <map>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 class OutputFormatter
 {