diff --git a/vendor/fbtransform/transforms/__tests__/react-test.js b/vendor/fbtransform/transforms/__tests__/react-test.js
index 546db630d78..4b52741f5e8 100644
--- a/vendor/fbtransform/transforms/__tests__/react-test.js
+++ b/vendor/fbtransform/transforms/__tests__/react-test.js
@@ -357,4 +357,33 @@ describe('react jsx', function() {
     expect(() => transform(code)).toThrow();
   });
 
+  it('should allow custom fallback nodes', function() {
+    var code = [
+      '/**',
+      ' * @jsx Custom.XML',
+      ' */',
+      '<CustomNode>',
+      '  <div />',
+      '  <Component />',
+      '</CustomNode>'
+    ].join('\n');
+    var result = [
+      '/**',
+      ' * @jsx Custom.XML',
+      ' */',
+      'Custom.XML.CustomNode(null,',
+      '  div(null),',
+      '  Component(null)',
+      ');'
+    ].join('\n');
+
+    expect(() => transform(code, {
+      fallbackTags: {
+        'Custom.XML': {
+          CustomNode: true
+        }
+      }
+    }).code).toBe(result);
+  });
+
 });
diff --git a/vendor/fbtransform/transforms/react.js b/vendor/fbtransform/transforms/react.js
index c79eaa85f56..c50e36a083d 100644
--- a/vendor/fbtransform/transforms/react.js
+++ b/vendor/fbtransform/transforms/react.js
@@ -61,10 +61,17 @@ function visitReactTag(traverse, object, path, state) {
     throw new Error('Namespace tags are not supported. ReactJSX is not XML.');
   }
 
+  var customFallbackTags = state.g.opts.fallbackTags;
+  var fallbackTags =
+    (customFallbackTags &&
+      customFallbackTags.hasOwnProperty(jsxObjIdent) &&
+      customFallbackTags[jsxObjIdent]) ||
+    FALLBACK_TAGS;
+
   // Only identifiers can be fallback tags. XJSMemberExpressions are not.
   var isFallbackTag =
     nameObject.type === Syntax.XJSIdentifier &&
-    FALLBACK_TAGS.hasOwnProperty(nameObject.name);
+    fallbackTags.hasOwnProperty(nameObject.name);
 
   utils.append(isFallbackTag ? jsxObjIdent + '.' : '', state);