diff --git a/zerver/management/commands/realm_domain.py b/zerver/management/commands/realm_domain.py
index e913eafdfe..f77c6ea03f 100644
--- a/zerver/management/commands/realm_domain.py
+++ b/zerver/management/commands/realm_domain.py
@@ -30,6 +30,7 @@ class Command(ZulipBaseCommand):
         if options["op"] == "show":
             print(f"Domains for {realm.string_id}:")
             for realm_domain in get_realm_domains(realm):
+                assert isinstance(realm_domain["domain"], str)
                 if realm_domain["allow_subdomains"]:
                     print(realm_domain["domain"] + " (subdomains allowed)")
                 else:
diff --git a/zerver/models.py b/zerver/models.py
index 6eb709975a..7291e486c0 100644
--- a/zerver/models.py
+++ b/zerver/models.py
@@ -1049,7 +1049,7 @@ class EmailContainsPlusError(Exception):
     pass
 
 
-def get_realm_domains(realm: Realm) -> List[Dict[str, str]]:
+def get_realm_domains(realm: Realm) -> List[Dict[str, Union[str, bool]]]:
     return list(realm.realmdomain_set.values("domain", "allow_subdomains"))