diff --git a/modules/mysql/read_replica.tf b/modules/mysql/read_replica.tf
index 01995648..70e9906d 100644
--- a/modules/mysql/read_replica.tf
+++ b/modules/mysql/read_replica.tf
@@ -132,6 +132,9 @@ resource "google_sql_database_instance" "replicas" {
       settings[0].maintenance_window,
       encryption_key_name,
     ]
+    replace_triggered_by = [
+      google_sql_database_instance.default.master_instance_name
+    ]
   }
 
   timeouts {
diff --git a/modules/postgresql/read_replica.tf b/modules/postgresql/read_replica.tf
index 3cae2aa1..1a4c5a5d 100644
--- a/modules/postgresql/read_replica.tf
+++ b/modules/postgresql/read_replica.tf
@@ -119,6 +119,9 @@ resource "google_sql_database_instance" "replicas" {
       settings[0].maintenance_window,
       encryption_key_name,
     ]
+    replace_triggered_by = [
+      google_sql_database_instance.default.master_instance_name
+    ]
   }
 
   timeouts {