diff --git a/packages/core/pattern.mjs b/packages/core/pattern.mjs
index 1d1297a5..1c1b41a5 100644
--- a/packages/core/pattern.mjs
+++ b/packages/core/pattern.mjs
@@ -794,7 +794,7 @@ function _composeOp(a, b, func) {
 // pattern composers
 const composers = {
   set: (a, b) => b,
-  const: id,
+  keep: (a, b) => a,
   add: (a, b) => a + b,
   sub: (a, b) => a - b,
   mul: (a, b) => a * b,