diff --git a/doc/Changelog b/doc/Changelog
index ec84296f8..75b3822d3 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,6 @@
+21 May 2020: George
+	- Fix for integer overflow when printing RDF_TYPE_TIME.
+
 19 May 2020: Wouter
 	- CVE-2020-12662 Unbound can be tricked into amplifying an incoming
 	  query into a large number of queries directed to a target.
diff --git a/sldns/parseutil.c b/sldns/parseutil.c
index 82dbc0fe1..3515d64c5 100644
--- a/sldns/parseutil.c
+++ b/sldns/parseutil.c
@@ -167,7 +167,7 @@ sldns_gmtime64_r(int64_t clock, struct tm *result)
 static int64_t
 sldns_serial_arithmetics_time(int32_t time, time_t now)
 {
-	int32_t offset = time - (int32_t) now;
+	int32_t offset = (int32_t)((uint32_t) time - (uint32_t) now);
 	return (int64_t) now + offset;
 }