diff --git a/NXDNGateway/APRSWriter.cpp b/NXDNGateway/APRSWriter.cpp
index cb67049..df2e347 100644
--- a/NXDNGateway/APRSWriter.cpp
+++ b/NXDNGateway/APRSWriter.cpp
@@ -228,8 +228,13 @@ void CAPRSWriter::sendIdFrameMobile()
 	if (!::gps_waiting(&m_gpsdData, 0))
 		return;
 
+#if GPSD_API_MAJOR_VERSION >= 7
 	if (::gps_read(&m_gpsdData, NULL, 0) <= 0)
 		return;
+#else
+	if (::gps_read(&m_gpsdData) <= 0)
+		return;
+#endif
 
 	if (m_gpsdData.status != STATUS_FIX)
 		return;