diff --git a/testcode/testbound.c b/testcode/testbound.c
index c28b8bca7..0f12c7996 100644
--- a/testcode/testbound.c
+++ b/testcode/testbound.c
@@ -264,7 +264,7 @@ main(int argc, char* argv[])
 	struct replay_scenario* scen = NULL;
 
 	/* we do not want the test to depend on the timezone */
-	(void)setenv("TZ", "UTC", 1);
+	(void)putenv("TZ=UTC");
 
 	log_init(NULL, 0, NULL);
 	log_info("Start of %s testbound program.", PACKAGE_STRING);