diff --git a/core/connection.js b/core/connection.js
index 91a6f19a7..2832dfe73 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -603,6 +603,13 @@ Blockly.Connection.prototype.setCheck = function(check) {
   return this;
 };
 
+/**
+ * Get a connection's compatibility.
+ * @return {Array} List of compatible value types.
+ */
+Blockly.Connection.prototype.getCheck = function() {
+  return this.check_;
+};
 /**
  * Change a connection's shadow block.
  * @param {Element} shadow DOM representation of a block or null.