diff --git a/src/isomorphic/classic/types/ReactPropTypes.js b/src/isomorphic/classic/types/ReactPropTypes.js
index 99c036496a..f0926fd4d7 100644
--- a/src/isomorphic/classic/types/ReactPropTypes.js
+++ b/src/isomorphic/classic/types/ReactPropTypes.js
@@ -73,6 +73,7 @@ var ReactPropTypes = {
   number: createPrimitiveTypeChecker('number'),
   object: createPrimitiveTypeChecker('object'),
   string: createPrimitiveTypeChecker('string'),
+  symbol: createPrimitiveTypeChecker('symbol'),
 
   any: createAnyTypeChecker(),
   arrayOf: createArrayOfTypeChecker,