diff --git a/mk/source.mk b/mk/source.mk
index 4033976fac..7802ad95fb 100644
--- a/mk/source.mk
+++ b/mk/source.mk
@@ -172,7 +172,7 @@ COMMON_SRC = \
             io/rcdevice_cam.c \
             io/rcdevice.c \
             io/gps.c \
-	    io/gps_utils.c \
+            io/gps_utils.c \
             io/ledstrip.c \
             io/pidaudio.c \
             osd/osd.c \
diff --git a/src/main/drivers/serial.c b/src/main/drivers/serial.c
index e7bb602676..4f85663b0a 100644
--- a/src/main/drivers/serial.c
+++ b/src/main/drivers/serial.c
@@ -20,6 +20,7 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
 
 #include "platform.h"
 
@@ -27,7 +28,7 @@
 
 void serialPrint(serialPort_t *instance, const char *str)
 {
-    serialWriteBuf(instance, str, strlen(str);
+    serialWriteBuf(instance, (const uint8_t*)str, strlen(str));
 }
 
 uint32_t serialGetBaudRate(serialPort_t *instance)
diff --git a/src/main/io/gps_utils.c b/src/main/io/gps_utils.c
index 208787b6a2..c30a4dc98e 100644
--- a/src/main/io/gps_utils.c
+++ b/src/main/io/gps_utils.c
@@ -1,5 +1,28 @@
+/*
+ * This file is part of Betaflight.
+ *
+ * Betaflight is free software. You can redistribute this software
+ * and/or modify this software under the terms of the GNU General
+ * Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * Betaflight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this software.
+ *
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include <stdarg.h>
 
+#include "platform.h"
+
 #include "common/printf.h"
 #include "io/serial.h"
 
diff --git a/src/main/io/gps_utils.h b/src/main/io/gps_utils.h
index 2aaba1f2d9..51bda13037 100644
--- a/src/main/io/gps_utils.h
+++ b/src/main/io/gps_utils.h
@@ -1,3 +1,24 @@
+/*
+ * This file is part of Betaflight.
+ *
+ * Betaflight is free software. You can redistribute this software
+ * and/or modify this software under the terms of the GNU General
+ * Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * Betaflight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this software.
+ *
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 int nmeaPrintf(serialPort_t *port, const char *format, ...);
diff --git a/src/test/unit/gps_nmea_unittest.cc b/src/test/unit/gps_nmea_unittest.cc
index 847aa6d43a..aa90e58fd6 100644
--- a/src/test/unit/gps_nmea_unittest.cc
+++ b/src/test/unit/gps_nmea_unittest.cc
@@ -1,18 +1,22 @@
 /*
- * This file is part of Cleanflight.
+ * This file is part of Betaflight.
  *
- * Cleanflight is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ * Betaflight is free software. You can redistribute this software
+ * and/or modify this software under the terms of the GNU General
+ * Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later
+ * version.
  *
- * Cleanflight is distributed in the hope that it will be useful,
+ * Betaflight is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  *
- * You should have received a copy of the GNU General Public License
- * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this software.
+ *
+ * If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <string.h>