diff --git a/installers/charm/lcm/src/charm.py b/installers/charm/lcm/src/charm.py
index 10257ba..4e0b4be 100755
--- a/installers/charm/lcm/src/charm.py
+++ b/installers/charm/lcm/src/charm.py
@@ -189,7 +189,8 @@
                 "OSMLCM_STORAGE_DRIVER": "mongo",
                 "OSMLCM_STORAGE_PATH": "/app/storage",
                 "OSMLCM_STORAGE_COLLECTION": "files",
-                "OSMLCM_STORAGE_URI": self.mongodb_client.connection_string,
+                "OSMLCM_STORAGE_URI": config.mongodb_uri
+                or self.mongodb_client.connection_string,
             }
         )
         if config.vca_host:
diff --git a/installers/charm/nbi/src/charm.py b/installers/charm/nbi/src/charm.py
index 550c88b..bbbf5ec 100755
--- a/installers/charm/nbi/src/charm.py
+++ b/installers/charm/nbi/src/charm.py
@@ -210,7 +210,8 @@
                 "OSMNBI_STORAGE_DRIVER": "mongo",
                 "OSMNBI_STORAGE_PATH": "/app/storage",
                 "OSMNBI_STORAGE_COLLECTION": "files",
-                "OSMNBI_STORAGE_URI": self.mongodb_client.connection_string,
+                "OSMNBI_STORAGE_URI": config.mongodb_uri
+                or self.mongodb_client.connection_string,
                 # Prometheus configuration
                 "OSMNBI_PROMETHEUS_HOST": self.prometheus_client.hostname,
                 "OSMNBI_PROMETHEUS_PORT": self.prometheus_client.port,