diff --git a/tests/zones/invalid.zone. b/tests/zones/invalid.zone.
index c814af6..04748a1 100644
--- a/tests/zones/invalid.zone.
+++ b/tests/zones/invalid.zone.
@@ -1,5 +1,5 @@
 $ORIGIN invalid.zone.
-@           IN	SOA	ns1.invalid.zone. root.invalid.zone. (
+@           3600 IN	SOA	ns1.invalid.zone. root.invalid.zone. (
                         2018071501		; Serial
                         3600    ; Refresh (1 hour)
                         600     ; Retry (10 minutes)
diff --git a/tests/zones/unit.tests. b/tests/zones/unit.tests.
index 95828ad..0305e05 100644
--- a/tests/zones/unit.tests.
+++ b/tests/zones/unit.tests.
@@ -1,5 +1,5 @@
 $ORIGIN unit.tests.
-@           IN	SOA	ns1.unit.tests. root.unit.tests. (
+@           3600 IN	SOA	ns1.unit.tests. root.unit.tests. (
                         2018071501		; Serial
                         3600    ; Refresh (1 hour)
                         600     ; Retry (10 minutes)