diff --git a/brigade-worker/src/index.ts b/brigade-worker/src/index.ts
index 68503aed3..1c5c5f519 100644
--- a/brigade-worker/src/index.ts
+++ b/brigade-worker/src/index.ts
@@ -8,6 +8,9 @@
  * - `BRIGADE_EVENT_PROVIDER`: The name of the event provider, such as `github` or `dockerhub`
  * - `BRIGADE_PROJECT_ID`: The project ID. This is used to load the Project
  *   object from configuration.
+ * - `BRIGADE_REMOTE_URL`: The URL from which to obtain source code to be built.
+ *   This is optional. If left unset by the controller, the worker will fall
+ *   back to a project-level URL.
  * - `BRIGADE_COMMIT_ID`: The VCS commit ID (e.g. the Git commit)
  * - `BRIGADE_COMMIT_REF`: The VCS full reference, defaults to
  *   `refs/heads/master`
@@ -107,6 +110,7 @@ let e: events.BrigadeEvent = {
   workerID: process.env.BRIGADE_BUILD_NAME || `unknown-${defaultULID}`,
   type: process.env.BRIGADE_EVENT_TYPE || "ping",
   provider: process.env.BRIGADE_EVENT_PROVIDER || "unknown",
+  cloneURL: process.env.BRIGADE_REMOTE_URL,
   revision: {
     commit: process.env.BRIGADE_COMMIT_ID,
     ref: process.env.BRIGADE_COMMIT_REF
diff --git a/brigade-worker/src/k8s.ts b/brigade-worker/src/k8s.ts
index ce8d15e8e..3a1964579 100644
--- a/brigade-worker/src/k8s.ts
+++ b/brigade-worker/src/k8s.ts
@@ -839,6 +839,15 @@ function sidecarSpec(
     imageTag = "brigadecore/git-sidecar:latest";
   }
 
+  // Try to get cloneURL from the event first. This allows gateways to override
+	// the project-level cloneURL if the commit that should be built, for
+	// instance, exists only within a fork. If this isn't set at the event-level,
+	// fall back to the project-level default.
+  let cloneURL = e.cloneURL;
+  if (cloneURL == "") {
+    cloneURL = project.repo.cloneURL
+  }
+
   let spec = new kubernetes.V1Container();
   (spec.name = "vcs-sidecar"),
     (spec.env = [
@@ -849,7 +858,7 @@ function sidecarSpec(
       envVar("BRIGADE_EVENT_PROVIDER", e.provider),
       envVar("BRIGADE_EVENT_TYPE", e.type),
       envVar("BRIGADE_PROJECT_ID", project.id),
-      envVar("BRIGADE_REMOTE_URL", project.repo.cloneURL),
+      envVar("BRIGADE_REMOTE_URL", cloneURL),
       envVar("BRIGADE_WORKSPACE", local),
       envVar("BRIGADE_PROJECT_NAMESPACE", project.kubernetes.namespace),
       envVar("BRIGADE_SUBMODULES", initGitSubmodules.toString()),