diff --git a/t/helper/test-date.c b/t/helper/test-date.c
index 792a805..f9e2b91 100644
--- a/t/helper/test-date.c
+++ b/t/helper/test-date.c
@@ -83,7 +83,7 @@
 	}
 }
 
-static void getnanos(const char **argv, struct timeval *now)
+static void getnanos(const char **argv)
 {
 	double seconds = getnanotime() / 1.0e9;
 
@@ -119,7 +119,7 @@
 	else if (!strcmp(*argv, "timestamp"))
 		parse_approx_timestamp(argv+1, &now);
 	else if (!strcmp(*argv, "getnanos"))
-		getnanos(argv+1, &now);
+		getnanos(argv+1);
 	else if (!strcmp(*argv, "is64bit"))
 		return sizeof(timestamp_t) == 8 ? 0 : 1;
 	else if (!strcmp(*argv, "time_t-is64bit"))