diff --git a/libraries/AP_GPS/AP_GPS_ERB.h b/libraries/AP_GPS/AP_GPS_ERB.h
index 8d04697111..5c0c3fc825 100644
--- a/libraries/AP_GPS/AP_GPS_ERB.h
+++ b/libraries/AP_GPS/AP_GPS_ERB.h
@@ -90,7 +90,7 @@ private:
         erb_stat stat;
         erb_dops dops;
         erb_vel vel;
-        uint8_t bytes[];
+        uint8_t bytes[1];
     } _buffer;
 
     enum erb_protocol_bytes {
diff --git a/libraries/AP_GPS/AP_GPS_MTK.h b/libraries/AP_GPS/AP_GPS_MTK.h
index e8ce210e3a..fa2188f125 100644
--- a/libraries/AP_GPS/AP_GPS_MTK.h
+++ b/libraries/AP_GPS/AP_GPS_MTK.h
@@ -72,7 +72,7 @@ private:
     // Receive buffer
     union PACKED {
         diyd_mtk_msg msg;
-        uint8_t bytes[];
+        uint8_t bytes[1];
     } _buffer;
 
     // Buffer parse & GPS state update
diff --git a/libraries/AP_GPS/AP_GPS_MTK19.h b/libraries/AP_GPS/AP_GPS_MTK19.h
index 43b08618a2..054a94c491 100644
--- a/libraries/AP_GPS/AP_GPS_MTK19.h
+++ b/libraries/AP_GPS/AP_GPS_MTK19.h
@@ -78,6 +78,6 @@ private:
     // Receive buffer
     union {
         diyd_mtk_msg msg;
-        uint8_t bytes[];
+        uint8_t bytes[1];
     } _buffer;
 };
diff --git a/libraries/AP_GPS/AP_GPS_SIRF.h b/libraries/AP_GPS/AP_GPS_SIRF.h
index 6c6f74bc90..8833c9ca7f 100644
--- a/libraries/AP_GPS/AP_GPS_SIRF.h
+++ b/libraries/AP_GPS/AP_GPS_SIRF.h
@@ -98,7 +98,7 @@ private:
     // Message buffer
     union {
         sirf_geonav nav;
-        uint8_t bytes[];
+        uint8_t bytes[1];
     } _buffer;
 
     bool        _parse_gps(void);
diff --git a/libraries/AP_GPS/AP_GPS_UBLOX.h b/libraries/AP_GPS/AP_GPS_UBLOX.h
index 2ea52abad0..c33316e9f1 100644
--- a/libraries/AP_GPS/AP_GPS_UBLOX.h
+++ b/libraries/AP_GPS/AP_GPS_UBLOX.h
@@ -384,7 +384,7 @@ private:
         ubx_rxm_rawx rxm_rawx;
 #endif
         ubx_ack_ack ack;
-        uint8_t bytes[];
+        uint8_t bytes[1];
     } _buffer;
 
     enum ubs_protocol_bytes {