diff --git a/src/awkward/_v2/cpp-headers/awkward/BuilderOptions.h b/src/awkward/_v2/cpp-headers/awkward/BuilderOptions.h
index 7cecd1cd76..036aa0cc11 100644
--- a/src/awkward/_v2/cpp-headers/awkward/BuilderOptions.h
+++ b/src/awkward/_v2/cpp-headers/awkward/BuilderOptions.h
@@ -8,6 +8,7 @@
 #include <tuple>
 #include <type_traits>
 #include <vector>
+#include <stdint.h>
 
 namespace awkward {
 
diff --git a/src/awkward/_v2/cpp-headers/awkward/GrowableBuffer.h b/src/awkward/_v2/cpp-headers/awkward/GrowableBuffer.h
index aae884453e..62f5a96153 100644
--- a/src/awkward/_v2/cpp-headers/awkward/GrowableBuffer.h
+++ b/src/awkward/_v2/cpp-headers/awkward/GrowableBuffer.h
@@ -13,6 +13,7 @@
 #include <iostream>
 #include <utility>
 #include <stdexcept>
+#include <stdint.h>
 
 namespace awkward {
 
diff --git a/src/awkward/_v2/cpp-headers/awkward/utils.h b/src/awkward/_v2/cpp-headers/awkward/utils.h
index 4074aa6cd6..14b66647ae 100644
--- a/src/awkward/_v2/cpp-headers/awkward/utils.h
+++ b/src/awkward/_v2/cpp-headers/awkward/utils.h
@@ -9,6 +9,7 @@
 #include <cassert>
 #include <utility>
 #include <stdexcept>
+#include <stdint.h>
 
 namespace awkward {