diff --git a/coders/histogram.c b/coders/histogram.c
index f40c5bc286..9b99d63700 100644
--- a/coders/histogram.c
+++ b/coders/histogram.c
@@ -56,6 +56,7 @@
 #include "MagickCore/memory_.h"
 #include "MagickCore/monitor.h"
 #include "MagickCore/monitor-private.h"
+#include "MagickCore/nt-base-private.h"
 #include "MagickCore/option.h"
 #include "MagickCore/pixel-accessor.h"
 #include "MagickCore/property.h"
diff --git a/coders/ora.c b/coders/ora.c
index 42a9dbf887..5fc1181c5c 100644
--- a/coders/ora.c
+++ b/coders/ora.c
@@ -54,6 +54,7 @@
 #include "MagickCore/magick.h"
 #include "MagickCore/memory_.h"
 #include "MagickCore/module.h"
+#include "MagickCore/nt-base-private.h"
 #include "MagickCore/quantum-private.h"
 #include "MagickCore/static.h"
 #include "MagickCore/resource_.h"