diff --git a/installers/charm/prometheus/tests/test_charm.py b/installers/charm/prometheus/tests/test_charm.py
index 687c38a..965400a 100644
--- a/installers/charm/prometheus/tests/test_charm.py
+++ b/installers/charm/prometheus/tests/test_charm.py
@@ -77,7 +77,7 @@
     ) -> NoReturn:
         """Test to see if prometheus relation is updated."""
         expected_result = {
-            "hostname": "prometheus",
+            "hostname": self.harness.charm.app.name,
             "port": "9090",
             "user": "admin",
             "password": "1234",
@@ -85,7 +85,9 @@
 
         relation_id = self.harness.add_relation("prometheus", "mon")
         self.harness.add_relation_unit(relation_id, "mon/0")
-        relation_data = self.harness.get_relation_data(relation_id, "prometheus")
+        relation_data = self.harness.get_relation_data(
+            relation_id, self.harness.charm.app.name
+        )
 
         self.assertDictEqual(expected_result, relation_data)
 
@@ -98,7 +100,9 @@
         self.harness.set_leader(is_leader=False)
         relation_id = self.harness.add_relation("prometheus", "mon")
         self.harness.add_relation_unit(relation_id, "mon/0")
-        relation_data = self.harness.get_relation_data(relation_id, "prometheus")
+        relation_data = self.harness.get_relation_data(
+            relation_id, self.harness.charm.app.name
+        )
 
         self.assertDictEqual(expected_result, relation_data)