diff --git a/package/contents/ui/Engine.qml b/package/contents/ui/Engine.qml
index 83a2420..6d904d2 100644
--- a/package/contents/ui/Engine.qml
+++ b/package/contents/ui/Engine.qml
@@ -1907,7 +1907,7 @@ Item {
         root.isCheckingFlake = true;
         const epoch = root.flakeEpoch;
         const settingsKey = root.probeSettingsKey;
-        const probeEnv = "NIXDATIFIER_CHECK_TARBALLS=" + (root.settings.checkTarballs ? "on " : "off ") + "NIXDATIFIER_DEEP_INPUTS=" + (root.settings.deepInputCheck ? "on " : "off ") + "NIXDATIFIER_IGNORE_INPUTS=" + shq(root.settings.ignoredInputs || "");
+        const probeEnv = "NIXDATIFIER_CHECK_TARBALLS=" + (root.settings.checkTarballs ? "on " : "off ") + "NIXDATIFIER_DEEP_INPUTS=" + (root.settings.deepInputCheck ? "on " : "off ") + "NIXDATIFIER_IGNORE_INPUTS=" + shq(root.settings.ignoredInputs || "") + " ";
         sh(probeEnv + shq(root.scriptDir + "run") + " cached " + shq("flake:" + root.flakePath + (probeEnv ? ":" + probeEnv.trim() : "")) + " 30 -- " + shq(root.scriptDir + "flake-probe") + " " + shq(root.flakePath), function (cmd, out, err, code) {
             root.isCheckingFlake = false;
             if (epoch !== root.flakeEpoch || settingsKey !== root.probeSettingsKey)
diff --git a/tests/tst_Engine.qml b/tests/tst_Engine.qml
index 44a4cb3..6f98eed 100644
--- a/tests/tst_Engine.qml
+++ b/tests/tst_Engine.qml
@@ -597,6 +597,19 @@ Item {
             compare(lines[2].split("\t")[0], "hm");
             compare(lines[3].split("\t")[0], "extra");
         }
+        function test_flake_check_keeps_the_input_list_apart_from_the_helper() {
+            // Glued to the assignment, the helper's path became its value and bash ran `cached` (#38).
+            const original = cfg.ignoredInputs;
+            for (const list of ["", "nur"]) {
+                cfg.ignoredInputs = list;
+                jobs = [];
+                core.isCheckingFlake = false;
+                core.checkFlakeUpdates();
+                compare(jobs.length, 1);
+                verify(jobs[0].cmd.indexOf("NIXDATIFIER_IGNORE_INPUTS=" + core.shq(list) + " " + core.shq(core.scriptDir + "run") + " cached ") >= 0, jobs[0].cmd);
+            }
+            cfg.ignoredInputs = original;
+        }
         function test_putting_inputs_back_probes_only_those() {
             cfg.ignoredInputs = "nur,hm";
             core.initialized = true;