diff --git a/src/xrt/targets/cli/cli_cmd_calibrate.c b/src/xrt/targets/cli/cli_cmd_calibrate.c
index cd4412c9a..fcd048afa 100644
--- a/src/xrt/targets/cli/cli_cmd_calibrate.c
+++ b/src/xrt/targets/cli/cli_cmd_calibrate.c
@@ -9,6 +9,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <sys/types.h>
 
 #include "xrt/xrt_prober.h"
 #include "util/u_misc.h"