diff --git a/src/drivers/gps/gps.cpp b/src/drivers/gps/gps.cpp
index a4b3615657..556e412ecc 100644
--- a/src/drivers/gps/gps.cpp
+++ b/src/drivers/gps/gps.cpp
@@ -325,7 +325,7 @@ GPS::GPS(const char *path, gps_driver_mode_t mode, GPSHelper::Interface interfac
 
 	if (_mode == gps_driver_mode_t::None) {
 		// use parameter to select mode if not provided via CLI
-		char protocol_param_name[16];
+		char protocol_param_name[17];
 		snprintf(protocol_param_name, sizeof(protocol_param_name), "GPS_%i_PROTOCOL", (int)_instance + 1);
 		int32_t protocol = 0;
 		param_get(param_find(protocol_param_name), &protocol);