diff --git a/src/components/PatchHelper.tsx b/src/components/PatchHelper.tsx
index b490051..853febc 100644
--- a/src/components/PatchHelper.tsx
+++ b/src/components/PatchHelper.tsx
@@ -119,7 +119,7 @@ function ReplacementComponent({ module, match, replacement, setReplacementError
             {!!diff?.length && (
                 <Button className={Margins.marginTop20} onClick={() => {
                     try {
-                        Function(patchedCode);
+                        Function(patchedCode.replace(/^function\(/, "function patchedModule("));
                         setCompileResult([true, "Compiled successfully"]);
                     } catch (err) {
                         setCompileResult([false, (err as Error).message]);
diff --git a/src/webpack/patchWebpack.ts b/src/webpack/patchWebpack.ts
index b3cfd70..fa6767c 100644
--- a/src/webpack/patchWebpack.ts
+++ b/src/webpack/patchWebpack.ts
@@ -57,6 +57,11 @@ function patchPush() {
                 // ever targets newer browsers, the minifier could potentially use this trick and
                 // cause issues.
                 let code: string = mod.toString().replaceAll("\n", "");
+                // a very small minority of modules use function() instead of arrow functions,
+                // but, unnamed toplevel functions aren't valid. Thus, give those a name
+                if (code.startsWith("function(")) {
+                    code = "function patchedModule" + code.slice("function".length);
+                }
                 const originalMod = mod;
                 const patchedBy = new Set();