diff --git a/tools/fdtgrep.c b/tools/fdtgrep.c
index 7af77b7..8d33205 100644
--- a/tools/fdtgrep.c
+++ b/tools/fdtgrep.c
@@ -10,7 +10,10 @@
 
 #include <assert.h>
 #include <ctype.h>
+#include <errno.h>
 #include <getopt.h>
+#include <fcntl.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>