diff --git a/Rendering/vtkFreeTypeTools.cxx b/Rendering/vtkFreeTypeTools.cxx
index 273d458c4059e6ca412fadde42667775ec091139..7de4220d9fdfd698f8662e69231f11735c972e7b 100644
--- a/Rendering/vtkFreeTypeTools.cxx
+++ b/Rendering/vtkFreeTypeTools.cxx
@@ -31,6 +31,8 @@
 // The embedded fonts
 #include "fonts/vtkEmbeddedFonts.h"
 
+#include <stdint.h>
+
 #ifdef FTGL_USE_NAMESPACE
 using namespace ftgl;
 #endif
diff --git a/Rendering/vtkFreeTypeUtilities.cxx b/Rendering/vtkFreeTypeUtilities.cxx
index c424dd213159259cb1e8bbe4a21269804aec2653..6060136a0ed16bd5f1f9cad06d73288ec192e65a 100644
--- a/Rendering/vtkFreeTypeUtilities.cxx
+++ b/Rendering/vtkFreeTypeUtilities.cxx
@@ -31,6 +31,7 @@
 #include "fonts/vtkEmbeddedFonts.h"
 
 #include <sys/stat.h>
+#include <stdint.h>
 
 #ifdef FTGL_USE_NAMESPACE
 using namespace ftgl;