diff --git a/tests/mattermost-lts/ops.py b/tests/mattermost-lts/ops.py
index 1f33c85..605222d 100644
--- a/tests/mattermost-lts/ops.py
+++ b/tests/mattermost-lts/ops.py
@@ -17,7 +17,7 @@ def _psql(domain, sql):
         "PGPASSWORD=$(cat /run/secrets/postgres_password) "
         f'psql -U mattermost -d mattermost -tAc "{sql}"'
     )
-    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()
+    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="postgres").strip()
 
 
 def _seed(domain, value):
diff --git a/tests/mattermost-lts/test_backup.py b/tests/mattermost-lts/test_backup.py
index 30b0716..65f02aa 100644
--- a/tests/mattermost-lts/test_backup.py
+++ b/tests/mattermost-lts/test_backup.py
@@ -14,7 +14,7 @@ def _psql(domain, sql):
         "PGPASSWORD=$(cat /run/secrets/postgres_password) "
         f'psql -U mattermost -d mattermost -tAc "{sql}"'
     )
-    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()
+    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="postgres").strip()
 
 
 def test_backup_captures_state(live_app):
diff --git a/tests/mattermost-lts/test_restore.py b/tests/mattermost-lts/test_restore.py
index c537a59..88b9b5f 100644
--- a/tests/mattermost-lts/test_restore.py
+++ b/tests/mattermost-lts/test_restore.py
@@ -15,7 +15,7 @@ def _psql(domain, sql):
         "PGPASSWORD=$(cat /run/secrets/postgres_password) "
         f'psql -U mattermost -d mattermost -tAc "{sql}"'
     )
-    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()
+    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="postgres").strip()
 
 
 def test_restore_returns_state(live_app):
diff --git a/tests/mattermost-lts/test_upgrade.py b/tests/mattermost-lts/test_upgrade.py
index ab26c93..da608a6 100644
--- a/tests/mattermost-lts/test_upgrade.py
+++ b/tests/mattermost-lts/test_upgrade.py
@@ -14,7 +14,7 @@ def _psql(domain, sql):
         "PGPASSWORD=$(cat /run/secrets/postgres_password) "
         f'psql -U mattermost -d mattermost -tAc "{sql}"'
     )
-    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()
+    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="postgres").strip()
 
 
 def test_upgrade_preserves_data(live_app):