diff --git a/IO/Image/vtkSEPReader.cxx b/IO/Image/vtkSEPReader.cxx
index 2b15bc249e..cec84d1712 100644
--- a/IO/Image/vtkSEPReader.cxx
+++ b/IO/Image/vtkSEPReader.cxx
@@ -34,7 +34,6 @@
 #include <vtksys/SystemTools.hxx>
 
 #include <algorithm>
-#include <cstdint>
 
 namespace details
 {
diff --git a/IO/Image/vtkSEPReader.h b/IO/Image/vtkSEPReader.h
index 83d127a41e..bdb33a258b 100644
--- a/IO/Image/vtkSEPReader.h
+++ b/IO/Image/vtkSEPReader.h
@@ -25,8 +25,9 @@
 #include "vtkImageAlgorithm.h"
 #include "vtkNew.h" // for ivars
 
-#include <array>  // for std::array
-#include <string> // for std::string
+#include <array>   // for std::array
+#include <cstdint> // for std::uint8_t
+#include <string>  // for std::string
 
 namespace details
 {
diff --git a/ThirdParty/libproj/vtklibproj/src/proj_json_streaming_writer.hpp b/ThirdParty/libproj/vtklibproj/src/proj_json_streaming_writer.hpp
index 6267684218..cf19b83af4 100644
--- a/ThirdParty/libproj/vtklibproj/src/proj_json_streaming_writer.hpp
+++ b/ThirdParty/libproj/vtklibproj/src/proj_json_streaming_writer.hpp
@@ -31,6 +31,7 @@
 
 /*! @cond Doxygen_Suppress */
 
+#include <cstdint>
 #include <vector>
 #include <string>