diff --git a/utility.c b/utility.c
index 5ad3529..2de07c9 100644
--- a/utility.c
+++ b/utility.c
@@ -4,6 +4,7 @@
 #include <unistd.h>
 #include <getopt.h>
 #include <sys/time.h>
+#include <time.h>
 #include <assert.h>
 #ifdef HAVE_CONFIG_H
 #include <config.h>