diff --git a/src/phage/workflow/PhageExecWorkflow.php b/src/phage/workflow/PhageExecWorkflow.php
--- a/src/phage/workflow/PhageExecWorkflow.php
+++ b/src/phage/workflow/PhageExecWorkflow.php
@@ -20,7 +20,7 @@
       ->setSynopsis(pht('Execute a Phage subprocess.'));
   }
 
-  protected function runWorkflow() {
+  public function runWorkflow() {
     $argv = $this->getArgument('argv');
     if (!$argv) {
       throw new PhutilArgumentUsageException(
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -259,6 +259,10 @@
     throw new PhutilMethodNotImplementedException();
   }
 
+  public function runWorkflow() {
+    throw new PhutilMethodNotImplementedException();
+  }
+
   /**
    * Finalizes any cleanup operations that need to occur regardless of
    * whether the command succeeded or failed.