diff --git a/api/services/enterprise/rbac_service.py b/api/services/enterprise/rbac_service.py
index e50da99191..8e506e8497 100644
--- a/api/services/enterprise/rbac_service.py
+++ b/api/services/enterprise/rbac_service.py
@@ -135,7 +135,7 @@ class AccessMatrixItem(_RBACModel):
     roles: list[dict[str, Any]] = Field(default_factory=list)
     accounts: list[dict[str, Any]] = Field(default_factory=list)
 
-    @field_validator("role_ids", "account_ids", mode="before")
+    @field_validator("roles", "accounts", mode="before")
     @classmethod
     def _coerce_empty_lists(cls, value: Any) -> list[dict[str, Any]]:
         if value is None: