diff --git a/ports/unix/unix_mphal.c b/ports/unix/unix_mphal.c
index 71edaa57a..9b009dc50 100644
--- a/ports/unix/unix_mphal.c
+++ b/ports/unix/unix_mphal.c
@@ -27,6 +27,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <sys/time.h>
 
 #include "py/mphal.h"