diff --git a/internal-dns/src/config.rs b/internal-dns/src/config.rs
index 3d033293a2..a9ff664030 100644
--- a/internal-dns/src/config.rs
+++ b/internal-dns/src/config.rs
@@ -615,6 +615,11 @@ mod test {
             b.service_backend_zone(ServiceName::Oximeter, &zone2, 125).unwrap();
             b.service_backend_zone(ServiceName::Oximeter, &zone3, 126).unwrap();
 
+            // Add a boundary NTP service to one of the zones; this will also
+            // populate the special `BOUNDARY_NTP_DNS_NAME`.
+            b.service_backend_zone(ServiceName::BoundaryNtp, &zone2, 127)
+                .unwrap();
+
             // A sharded service
             b.service_backend_sled(
                 ServiceName::SledAgent(sled1_uuid),
diff --git a/internal-dns/tests/output/internal-dns-zone.txt b/internal-dns/tests/output/internal-dns-zone.txt
index e8c3f01b05..d87805f677 100644
--- a/internal-dns/tests/output/internal-dns-zone.txt
+++ b/internal-dns/tests/output/internal-dns-zone.txt
@@ -68,6 +68,17 @@ builder: "non_trivial"
       "data": "::1:4"
     }
   ],
+  "_boundary-ntp._tcp": [
+    {
+      "type": "SRV",
+      "data": {
+        "port": 127,
+        "prio": 0,
+        "target": "001de000-c04e-4000-8000-000000000002.host.control-plane.oxide.internal",
+        "weight": 0
+      }
+    }
+  ],
   "_nexus._tcp": [
     {
       "type": "SRV",
@@ -118,5 +129,11 @@ builder: "non_trivial"
         "weight": 0
       }
     }
+  ],
+  "boundary-ntp": [
+    {
+      "type": "AAAA",
+      "data": "::1:2"
+    }
   ]
 }