diff --git a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
index 2a90d6ce29..ef0cc65c8e 100644
--- a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
+++ b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
@@ -120,12 +120,6 @@ final class PhabricatorProjectTransactionEditor
     PhabricatorApplicationTransaction $xaction) {
 
     switch ($xaction->getTransactionType()) {
-      case PhabricatorProjectLockTransaction::TRANSACTIONTYPE:
-        PhabricatorPolicyFilter::requireCapability(
-          $this->requireActor(),
-          newv($this->getEditorApplicationClass(), array()),
-          ProjectCanLockProjectsCapability::CAPABILITY);
-        return;
       case PhabricatorTransactions::TYPE_EDGE:
         switch ($xaction->getMetadataValue('edge:type')) {
           case PhabricatorProjectProjectHasMemberEdgeType::EDGECONST:
diff --git a/src/applications/project/xaction/PhabricatorProjectLockTransaction.php b/src/applications/project/xaction/PhabricatorProjectLockTransaction.php
index 42551dfb2c..c54c9284ce 100644
--- a/src/applications/project/xaction/PhabricatorProjectLockTransaction.php
+++ b/src/applications/project/xaction/PhabricatorProjectLockTransaction.php
@@ -53,4 +53,12 @@ final class PhabricatorProjectLockTransaction
     }
   }
 
+  public function validateTransactions($object, array $xactions) {
+    if ($xactions) {
+      $this->requireApplicationCapability(
+        ProjectCanLockProjectsCapability::CAPABILITY);
+    }
+    return array();
+  }
+
 }
diff --git a/src/applications/transactions/storage/PhabricatorModularTransactionType.php b/src/applications/transactions/storage/PhabricatorModularTransactionType.php
index eaf7d029ce..b0714aeccf 100644
--- a/src/applications/transactions/storage/PhabricatorModularTransactionType.php
+++ b/src/applications/transactions/storage/PhabricatorModularTransactionType.php
@@ -356,4 +356,14 @@ abstract class PhabricatorModularTransactionType
     return array();
   }
 
+  protected function requireApplicationCapability($capability) {
+    $application_class = $this->getEditor()->getEditorApplicationClass();
+    $application = newv($application_class, array());
+
+    PhabricatorPolicyFilter::requireCapability(
+      $this->getActor(),
+      $application,
+      $capability);
+  }
+
 }