diff --git a/src/fxp.d.ts b/src/fxp.d.ts
index 05e38de7..84199a16 100644
--- a/src/fxp.d.ts
+++ b/src/fxp.d.ts
@@ -1,4 +1,4 @@
-import type { Expression, ReadonlyMatcher } from './pem';
+import type { Expression, ReadonlyMatcher } from './pem.js';
 
 // jPath: true  → string
 // jPath: false → ReadonlyMatcher