diff --git a/Sources/KitchenSyncApp/Discovery/DeviceMatch.swift b/Sources/KitchenSyncApp/Discovery/DeviceMatch.swift
index bd973f4..d96e551 100644
--- a/Sources/KitchenSyncApp/Discovery/DeviceMatch.swift
+++ b/Sources/KitchenSyncApp/Discovery/DeviceMatch.swift
@@ -34,7 +34,9 @@ enum DeviceMatch {
     /// P4, `kstouch-dfd0` on the Touch, `x32link-7a1c` on the headless (ESP-035). Missing
     /// `kstouch` is what made a real device invisible once already.
     private static func matchesKnownHostname(_ name: String) -> Bool {
-        knownHostPrefixes.contains { name.hasPrefix($0) }
+        let lower = name.lowercased()   // a Bonjour instance name's case is not meaningful —
+                                        // the P4 advertises "KitchenSync", the Touch "kstouch-…"
+        return knownHostPrefixes.contains { lower.hasPrefix($0) }
     }
 
     /// `x32link` joined this list in ESP-035 — but adding it here was the SMALL half. That
diff --git a/Tests/KitchenSyncAppTests/DeviceMatchTests.swift b/Tests/KitchenSyncAppTests/DeviceMatchTests.swift
index e7bf692..f8c9122 100644
--- a/Tests/KitchenSyncAppTests/DeviceMatchTests.swift
+++ b/Tests/KitchenSyncAppTests/DeviceMatchTests.swift
@@ -16,6 +16,16 @@ final class DeviceMatchTests: XCTestCase {
                       "a real Touch on the bench was invisible to the app because of this")
     }
 
+    /// **A real P4 found this.** The ESP32-P4 advertises its Bonjour INSTANCE NAME as
+    /// "KitchenSync" (capital K, a friendly name), not the lowercase hostname the Touch
+    /// and X32Link use. hasPrefix is case-sensitive, so `"KitchenSync".hasPrefix(
+    /// "kitchensync")` is false and the P4 was invisible. A Bonjour name's case is not
+    /// meaningful; the match must be case-insensitive.
+    func test_the_p4_is_matched_despite_a_capitalised_instance_name() {
+        XCTAssertTrue(DeviceMatch.isKitchenSync(serviceName: "KitchenSync", txt: nil))
+        XCTAssertTrue(DeviceMatch.isKitchenSync(serviceName: "KSTouch-DFD0", txt: nil))
+    }
+
     /// Units already in the field have no TXT record and won't until they're reflashed. Breaking
     /// them would be a worse bug than the one being fixed.
     func test_the_existing_devices_still_match_on_hostname() {