diff --git a/packages/google-cloud-asset/src/v1/asset_service_client.ts b/packages/google-cloud-asset/src/v1/asset_service_client.ts
index 8db426c5c26..9c7ebb91590 100644
--- a/packages/google-cloud-asset/src/v1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1/asset_service_client.ts
@@ -142,8 +142,6 @@ export class AssetServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
-      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);
diff --git a/packages/google-cloud-asset/src/v1/asset_service_proto_list.json b/packages/google-cloud-asset/src/v1/asset_service_proto_list.json
index d519d6bffd1..37185e2cc13 100644
--- a/packages/google-cloud-asset/src/v1/asset_service_proto_list.json
+++ b/packages/google-cloud-asset/src/v1/asset_service_proto_list.json
@@ -1,10 +1,4 @@
 [
   "../../protos/google/cloud/asset/v1/asset_service.proto",
-  "../../protos/google/cloud/asset/v1/assets.proto",
-  "../../protos/google/cloud/orgpolicy/v1/orgpolicy.proto",
-  "../../protos/google/cloud/osconfig/v1/inventory.proto",
-  "../../protos/google/identity/accesscontextmanager/type/device_resources.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/access_level.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/access_policy.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/service_perimeter.proto"
+  "../../protos/google/cloud/asset/v1/assets.proto"
 ]
diff --git a/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
index 590f00888af..3bf4d360769 100644
--- a/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
@@ -139,8 +139,6 @@ export class AssetServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
-      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);
diff --git a/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
index 7dcbeee62ba..bc72a283da7 100644
--- a/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
@@ -131,8 +131,6 @@ export class AssetServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
-      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);
diff --git a/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
index 0cc2b59fab6..69526ea97fc 100644
--- a/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
@@ -137,8 +137,6 @@ export class AssetServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
-      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);
diff --git a/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
index 2e317883c91..c2717671446 100644
--- a/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
@@ -139,8 +139,6 @@ export class AssetServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
-      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);
diff --git a/packages/google-cloud-asset/src/v1p5beta1/asset_service_proto_list.json b/packages/google-cloud-asset/src/v1p5beta1/asset_service_proto_list.json
index 98ff312c565..cb107dd3fa8 100644
--- a/packages/google-cloud-asset/src/v1p5beta1/asset_service_proto_list.json
+++ b/packages/google-cloud-asset/src/v1p5beta1/asset_service_proto_list.json
@@ -1,9 +1,4 @@
 [
   "../../protos/google/cloud/asset/v1p5beta1/asset_service.proto",
-  "../../protos/google/cloud/asset/v1p5beta1/assets.proto",
-  "../../protos/google/cloud/orgpolicy/v1/orgpolicy.proto",
-  "../../protos/google/identity/accesscontextmanager/type/device_resources.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/access_level.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/access_policy.proto",
-  "../../protos/google/identity/accesscontextmanager/v1/service_perimeter.proto"
+  "../../protos/google/cloud/asset/v1p5beta1/assets.proto"
 ]