diff --git a/changelog.d/6805-test-reset-c5a-sets.md b/changelog.d/6805-test-reset-c5a-sets.md
new file mode 100644
index 0000000000..9c9c0a501f
--- /dev/null
+++ b/changelog.d/6805-test-reset-c5a-sets.md
@@ -0,0 +1 @@
+test(runtime): the class-field inline-guard test reset also clears the C5a per-key vetting hash sets, removing cross-test order dependence for reused key names (CodeRabbit follow-up on #6802).
diff --git a/crates/perry-runtime/src/object/descriptor_state.rs b/crates/perry-runtime/src/object/descriptor_state.rs
index 79191092ff..2a3d512d12 100644
--- a/crates/perry-runtime/src/object/descriptor_state.rs
+++ b/crates/perry-runtime/src/object/descriptor_state.rs
@@ -147,6 +147,16 @@ pub(crate) fn class_field_inline_guard_enabled() -> bool {
 #[cfg(test)]
 pub(crate) fn test_reset_class_field_inline_guard() {
     PERRY_CLASS_FIELD_INLINE_GUARD_DISABLED.store(0, Ordering::Relaxed);
+    // Also clear the C5a per-key vetting sets (production-monotonic, so
+    // without this a key name reused across tests in one process would
+    // inherit an earlier test's declared-field / installed-key state and
+    // make the disable decision order-dependent (CodeRabbit on #6802).
+    if let Ok(mut guard) = DECLARED_FIELD_NAME_HASHES.write() {
+        guard.take();
+    }
+    if let Ok(mut guard) = PROTO_DESCRIPTOR_KEY_HASHES.write() {
+        guard.take();
+    }
 }
 
 /// #5654: flip the process-wide inline gate only when the descriptor target can