diff --git a/src/de/inetsoftware/jwebassembly/wasm/ValueType.java b/src/de/inetsoftware/jwebassembly/wasm/ValueType.java
index 735b35a..2694eba 100644
--- a/src/de/inetsoftware/jwebassembly/wasm/ValueType.java
+++ b/src/de/inetsoftware/jwebassembly/wasm/ValueType.java
@@ -29,7 +29,7 @@ public enum ValueType implements AnyType {
     funcref(-0x10),
     anyref(-0x11),
     nullref(-0x12), // 0x6E https://webassembly.github.io/reference-types/core/appendix/index-types.html
-    ref_type(-0x12 ), // 0x6E https://github.com/lars-t-hansen/moz-gc-experiments/blob/master/version2.md
+    ref_type(-0x13 ), // 0x6D https://github.com/lars-t-hansen/moz-gc-experiments/blob/master/version2.md
     exnref(-0x18), // https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md
     func(-0x20),
     struct(-0x30),