diff --git a/OpenEXR/IlmImf/ImfDwaCompressor.cpp b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
index 59d1d5d1ed..585a3e654b 100644
--- a/OpenEXR/IlmImf/ImfDwaCompressor.cpp
+++ b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
@@ -159,6 +159,7 @@
 #include <limits>
 
 #include <cstddef>
+#include <cstdint>
 
 
 // Windows specific addition to prevent the indirect import of the redefined min/max macros
diff --git a/OpenEXR/IlmImf/ImfHuf.cpp b/OpenEXR/IlmImf/ImfHuf.cpp
index 271849b7bf..165fac58ef 100644
--- a/OpenEXR/IlmImf/ImfHuf.cpp
+++ b/OpenEXR/IlmImf/ImfHuf.cpp
@@ -53,6 +53,7 @@
 #include <cstring>
 #include <cassert>
 #include <algorithm>
+#include <cstdint>
 
 
 using namespace std;
diff --git a/OpenEXR/IlmImf/ImfMisc.cpp b/OpenEXR/IlmImf/ImfMisc.cpp
index d2c8478770..0451a3399a 100644
--- a/OpenEXR/IlmImf/ImfMisc.cpp
+++ b/OpenEXR/IlmImf/ImfMisc.cpp
@@ -54,6 +54,8 @@
 #include <ImfTileDescription.h>
 #include "ImfNamespace.h"
 
+#include <cstdint>
+
 OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER
 
 using IMATH_NAMESPACE::Box2i;