diff --git a/host/lib/fmap.c b/host/lib/fmap.c
index c95338d..347eef1 100644
--- a/host/lib/fmap.c
+++ b/host/lib/fmap.c
@@ -6,6 +6,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "fmap.h"