diff --git a/.changeset/tough-baboons-heal.md b/.changeset/tough-baboons-heal.md
new file mode 100644
index 0000000..c0b4afc
--- /dev/null
+++ b/.changeset/tough-baboons-heal.md
@@ -0,0 +1,7 @@
+---
+"reacord": patch
+---
+
+import react-reconciler/constants.js for esm
+
+ESM projects which tried to import reacord would fail due to the lack of .js on this import
diff --git a/packages/reacord/library/internal/reconciler.ts b/packages/reacord/library/internal/reconciler.ts
index c5e82ca..cbe9337 100644
--- a/packages/reacord/library/internal/reconciler.ts
+++ b/packages/reacord/library/internal/reconciler.ts
@@ -1,7 +1,7 @@
 import { raise } from "@reacord/helpers/raise.js"
 import type { HostConfig } from "react-reconciler"
 import ReactReconciler from "react-reconciler"
-import { DefaultEventPriority } from "react-reconciler/constants"
+import { DefaultEventPriority } from "react-reconciler/constants.js"
 import { Node } from "./node.js"
 import type { Renderer } from "./renderers/renderer"
 import { TextNode } from "./text-node.js"