diff --git a/src/pyodide/BUILD.bazel b/src/pyodide/BUILD.bazel
index aa0695d5526..27007613677 100644
--- a/src/pyodide/BUILD.bazel
+++ b/src/pyodide/BUILD.bazel
@@ -94,6 +94,13 @@ const location = undefined;
 function addEventListener(){}
 
 function reportUndefinedSymbolsNoOp() {}
+
+if (typeof FinalizationRegistry === "undefined") {
+    globalThis.FinalizationRegistry = class FinalizationRegistry {
+        register(){}
+        unregister(){}
+    };
+}
 """
 
 REPLACEMENTS = [