diff --git a/packages/xod-project/src/constants.js b/packages/xod-project/src/constants.js
index <HASH>..<HASH> 100644
--- a/packages/xod-project/src/constants.js
+++ b/packages/xod-project/src/constants.js
@@ -85,6 +85,7 @@ export const STATIC_TYPES_COMPATIBILITY = {
   },
   [PIN_TYPE.PORT]: {
     [PIN_TYPE.PORT]: true,
+    [PIN_TYPE.STRING]: true,
   },
 };
feat(xod-project): make the port type castable to the string type