diff --git a/pdl-live-react/src/pdl_ast_utils.ts b/pdl-live-react/src/pdl_ast_utils.ts
index 9cb36189d..7e3c59631 100644
--- a/pdl-live-react/src/pdl_ast_utils.ts
+++ b/pdl-live-react/src/pdl_ast_utils.ts
@@ -217,6 +217,10 @@ export function map_block_children(
     .with({ kind: "include" }, (block) => block)
     .with({ kind: "import" }, (block) => block)
     .with({ kind: "aggregator" }, (block) => block)
+    .with({ kind: "factor" }, (block) => {
+      const factor = f_expr(block.factor)
+      return { ...block, factor }
+    })
     .with({ kind: P.nullish }, (block) => block)
     // @ts-expect-error: TODO
     .exhaustive()
@@ -313,6 +317,9 @@ export function iter_block_children(
     .with({ kind: "include" }, () => {})
     .with({ kind: "import" }, () => {})
     .with({ kind: "aggregator" }, () => {})
+    .with({ kind: "factor" }, (block) => {
+      if (block.factor) f(block.factor)
+    })
     .with({ kind: undefined }, () => {})
     // @ts-expect-error: TODO
     .exhaustive()
diff --git a/pdl-live-react/src/view/timeline/model.ts b/pdl-live-react/src/view/timeline/model.ts
index 41b762cd0..da95a3ff6 100644
--- a/pdl-live-react/src/view/timeline/model.ts
+++ b/pdl-live-react/src/view/timeline/model.ts
@@ -152,6 +152,7 @@ export function childrenOf(block: NonScalarPdlBlock) {
       .with({ kind: "empty" }, (data) =>
         data.defs ? Object.values(data.defs) : [],
       )
+      .with({ kind: "factor" }, () => [])
       .with({ kind: "error" }, () => []) // TODO show errors in trace
       .with({ kind: P.nullish }, () => [])
       // @ts-expect-error: TODO