diff --git a/YSFGateway/APRSWriter.cpp b/YSFGateway/APRSWriter.cpp
index 672f165..87d3cd8 100644
--- a/YSFGateway/APRSWriter.cpp
+++ b/YSFGateway/APRSWriter.cpp
@@ -44,7 +44,7 @@ m_height(0)
 
 	if (!suffix.empty()) {
 		m_callsign.append("-");
-		m_callsign.append(suffix);
+		m_callsign.append(suffix.substr(0U, 1U));
 	}
 
 	m_thread = new CAPRSWriterThread(m_callsign, password, address, port);