diff --git a/utils/osmo-auc-gen.c b/utils/osmo-auc-gen.c
index fda045a..54128ff 100644
--- a/utils/osmo-auc-gen.c
+++ b/utils/osmo-auc-gen.c
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
+#include <time.h>
 #include <getopt.h>
 #include <unistd.h>
 #include <inttypes.h>