diff --git a/src/promise/src/Shared/Promise.lua b/src/promise/src/Shared/Promise.lua
index 52fb6fc514..d38f9bd23d 100644
--- a/src/promise/src/Shared/Promise.lua
+++ b/src/promise/src/Shared/Promise.lua
@@ -22,7 +22,7 @@ Promise.__index = Promise
 	@return boolean
 ]=]
 function Promise.isPromise(value)
-	return type(value) == "table" and value.ClassName == "Promise"
+	return type(value) == "table" and getmetatable(value) == Promise
 end
 
 --[=[