--- a/src/java.prefs/windows/native/libprefs/WindowsPreferences.c	Mon Apr 16 14:51:31 2018 +0200
+++ b/src/java.prefs/windows/native/libprefs/WindowsPreferences.c	Wed Apr 18 14:22:53 2018 +0200
@@ -28,6 +28,8 @@
 #include "jni.h"
 #include "jni_util.h"
 #include "jvm.h"
+#include "java_util_prefs_WindowsPreferences.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif