diff --git a/web/test-browser-wasm-smoke-opfs-parameter-sections.js b/web/test-browser-wasm-smoke-opfs-parameter-sections.js
index 0d22989..47e39ce 100644
--- a/web/test-browser-wasm-smoke-opfs-parameter-sections.js
+++ b/web/test-browser-wasm-smoke-opfs-parameter-sections.js
@@ -94,10 +94,10 @@ export async function runBrowserOpfsParameterSections(context, simulator) {
     // filename + ".bak", links the current parameter file to it,
     // then renames filename + ".new" over filename.
     await parseWithParameters("G21 G90\nG0 X4\nG28.1\nM30\n", "parameters/existing-save.var");
-    const existingSaveParameterFile = await readOpfsText(simulator, "parameters/existing-save.var");
-    expectIncludes(existingSaveParameterFile, "5161\t4.000000", "LinuxCNC existing OPFS parameter file was not replaced after save");
-    const existingSaveParameterBackup = await readOpfsText(simulator, "parameters/existing-save.var.bak");
-    expectIncludes(existingSaveParameterBackup, "5161\t3.000000", "LinuxCNC existing OPFS parameter backup did not replace the stale backup with the previous file");
+    await withSmokeSimulator(async (restoredBackupSimulator) => {
+      expectIncludes(await readOpfsText(restoredBackupSimulator, "parameters/existing-save.var"), "5161\t4.000000", "LinuxCNC existing OPFS parameter file was not restored in a new WASM instance");
+      expectIncludes(await readOpfsText(restoredBackupSimulator, "parameters/existing-save.var.bak"), "5161\t3.000000", "LinuxCNC existing OPFS parameter backup was not restored in a new WASM instance");
+    });
     await expectMissingOpfsFile(
       () => simulator.fs.opfs.readFile("parameters/existing-save.var.new"),
       "LinuxCNC existing OPFS parameter temporary file remained after save",