diff --git a/packages/jspsych/src/modules/randomization.ts b/packages/jspsych/src/modules/randomization.ts
index e58ebaff..5da2ee0f 100644
--- a/packages/jspsych/src/modules/randomization.ts
+++ b/packages/jspsych/src/modules/randomization.ts
@@ -1,5 +1,5 @@
 import rw from "random-words";
-import seedrandom from "seedrandom/lib/alea";
+import seedrandom from "seedrandom/lib/alea.js";
 
 /**
  * Uses the `seedrandom` package to replace Math.random() with a seedable PRNG.