diff --git a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceClient.java b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceClient.java
index 005dd1629282..0d45805d57e8 100644
--- a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceClient.java
+++ b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/TraceServiceClient.java
@@ -27,6 +27,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.trace.v1.stub.TraceServiceStub;
 import com.google.cloud.trace.v1.stub.TraceServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.devtools.cloudtrace.v1.GetTraceRequest;
 import com.google.devtools.cloudtrace.v1.ListTracesRequest;
 import com.google.devtools.cloudtrace.v1.ListTracesResponse;
@@ -472,7 +473,8 @@ public static ApiFuture<ListTracesPagedResponse> createAsync(
             public ListTracesPagedResponse apply(ListTracesPage input) {
               return new ListTracesPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListTracesPagedResponse(ListTracesPage page) {
diff --git a/google-cloud-clients/google-cloud-trace/synth.metadata b/google-cloud-clients/google-cloud-trace/synth.metadata
index ecb6d1165fa9..eadc17f8146d 100644
--- a/google-cloud-clients/google-cloud-trace/synth.metadata
+++ b/google-cloud-clients/google-cloud-trace/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-02-26T08:54:00.680348Z",
+  "updateTime": "2019-03-06T08:55:06.586413Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.14",
-        "dockerImage": "googleapis/artman@sha256:f3d61ae45abaeefb6be5f228cda22732c2f1b00fb687c79c4bd4f2c42bb1e1a7"
+        "version": "0.16.15",
+        "dockerImage": "googleapis/artman@sha256:9caadfa59d48224cba5f3217eb9d61a155b78ccf31e628abef385bc5b7ed3bd2"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "29f098cb03a9983cc9cb15993de5da64419046f2",
-        "internalRef": "235621085"
+        "sha": "856117505ff9075b3e9c0b5674113667b6cf9e00",
+        "internalRef": "236931378"
       }
     }
   ],