diff --git a/src/ast-spec.txt b/src/ast-spec.txt
index 1c0a27a93..56834cf8f 100644
--- a/src/ast-spec.txt
+++ b/src/ast-spec.txt
@@ -115,6 +115,7 @@ node BoltFunctionTypeExpression > BoltTypeExpression {
 node BoltTypeParameter {
   index: usize,
   name: BoltIdentifier,
+  typeNode: BoltTypeExpression,
   defaultType: Option<BoltTypeExpression>,
 }
 
diff --git a/src/parser.ts b/src/parser.ts
index 9f18d46c4..950c5716c 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -834,7 +834,7 @@ export class Parser {
       tokens.get();
       typeBound = this.parseTypeExpression(tokens);
     }
-    const node = createBoltTypeParameter(0, t0 as BoltIdentifier, typeBound)
+    const node = createBoltTypeParameter(0, t0 as BoltIdentifier, typeBound, null)
     setOrigNodeRange(node, t0, t0);
     return node;
   }