--- a/src/tls/x509v3.c
+++ b/src/tls/x509v3.c
@@ -1848,6 +1848,9 @@ int x509_certificate_chain_validate(stru
 		if (chain_trusted)
 			continue;
 
+#ifdef NO_TIMESTAMP_CHECK
+		disable_time_checks = 1;
+#endif
 		if (!disable_time_checks &&
 		    ((unsigned long) now.sec <
 		     (unsigned long) cert->not_before ||
