diff --git a/test-tools/host-tool/src/main.c b/test-tools/host-tool/src/main.c
index d343095d..ead6a9b9 100644
--- a/test-tools/host-tool/src/main.c
+++ b/test-tools/host-tool/src/main.c
@@ -20,6 +20,7 @@
 #include <errno.h>
 #include <getopt.h>
 #include <termios.h>
+#include <unistd.h>
 
 #include "host_tool_utils.h"
 #include "shared_utils.h"