diff --git a/generator/generator_config.textproto b/generator/generator_config.textproto
index 89af935c88916..89fc75387d321 100644
--- a/generator/generator_config.textproto
+++ b/generator/generator_config.textproto
@@ -307,6 +307,9 @@ service {
   emulator_endpoint_env_var: "BIGTABLE_EMULATOR_HOST"
   gen_async_rpcs: ["CheckConsistency"]
   retryable_status_codes: ["kUnavailable", "kAborted"]
+  idempotency_overrides: [
+    {rpc_name: "BigtableTableAdmin.CheckConsistency", idempotency: IDEMPOTENT}
+  ]
 }
 
 # Billing
diff --git a/google/cloud/bigtable/admin/bigtable_table_admin_connection_idempotency_policy.cc b/google/cloud/bigtable/admin/bigtable_table_admin_connection_idempotency_policy.cc
index ebc7c1bbe6d3f..7c58fe1d4a9a3 100644
--- a/google/cloud/bigtable/admin/bigtable_table_admin_connection_idempotency_policy.cc
+++ b/google/cloud/bigtable/admin/bigtable_table_admin_connection_idempotency_policy.cc
@@ -84,7 +84,7 @@ BigtableTableAdminConnectionIdempotencyPolicy::GenerateConsistencyToken(
 
 Idempotency BigtableTableAdminConnectionIdempotencyPolicy::CheckConsistency(
     google::bigtable::admin::v2::CheckConsistencyRequest const&) {
-  return Idempotency::kNonIdempotent;
+  return Idempotency::kIdempotent;
 }
 
 Idempotency BigtableTableAdminConnectionIdempotencyPolicy::CreateBackup(