--- a/include/image.h
+++ b/include/image.h
@@ -51,6 +51,10 @@
 
 #endif /* USE_HOSTCC */
 
+#ifndef ulong
+#define ulong unsigned long
+#endif
+
 #if defined(CONFIG_FIT)
 #include <fdt.h>
 #include <libfdt.h>