diff --git a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
index 5db4ebfa..a68bcda7 100644
--- a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
+++ b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
@@ -543,7 +543,13 @@ public UnaryCallable<GetIamPolicyRequest, Policy> getIamPolicyCallable() {
 
   @Override
   public final void close() {
-    shutdown();
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
   }
 
   @Override