diff --git a/tools/imagetool.h b/tools/imagetool.h
index 3e15b4e..b7874f4 100644
--- a/tools/imagetool.h
+++ b/tools/imagetool.h
@@ -16,6 +16,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 #include <u-boot/sha1.h>