From eac2a14ae75286cb06a28955a0dbd0b985149c7a Mon Sep 17 00:00:00 2001
From: Markus Engel <engel@sero-systems.de>
Date: Wed, 10 Dec 2025 11:58:43 +0100
Subject: [PATCH] fix extended squitter check

---
 .../de/serosystems/lib1090/msgs/modes/ExtendedSquitter.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/de/serosystems/lib1090/msgs/modes/ExtendedSquitter.java b/src/main/java/de/serosystems/lib1090/msgs/modes/ExtendedSquitter.java
index ff9efce..15efc3e 100644
--- a/src/main/java/de/serosystems/lib1090/msgs/modes/ExtendedSquitter.java
+++ b/src/main/java/de/serosystems/lib1090/msgs/modes/ExtendedSquitter.java
@@ -67,7 +67,7 @@ public ExtendedSquitter(ModeSDownlinkMsg reply) throws BadFormatException {
 		super(reply);
 		setType(subtype.EXTENDED_SQUITTER);
 
-		if (getDownlinkFormat() < 17 && getDownlinkFormat() > 19 ||
+		if (getDownlinkFormat() < 17 || getDownlinkFormat() > 19 ||
 				getDownlinkFormat() == 18 && (getFirstField() == 4 || getFirstField() == 7) ||
 				getDownlinkFormat() == 19 && getFirstField() > 0)
 			throw new BadFormatException("Message is not an extended squitter!");