diff --git a/libraries/DataFlash/LogFile.cpp b/libraries/DataFlash/LogFile.cpp
index daaa835481..a17c441a38 100644
--- a/libraries/DataFlash/LogFile.cpp
+++ b/libraries/DataFlash/LogFile.cpp
@@ -198,8 +198,8 @@ void DataFlash_Class::Log_Write_RFND(const RangeFinder &rangefinder)
 // Write an RCIN packet
 void DataFlash_Class::Log_Write_RCIN(void)
 {
-    uint16_t values[16] = {};
-    rc().get_radio_in(values, 14);
+    uint16_t values[14] = {};
+    rc().get_radio_in(values, ARRAY_SIZE(values));
     struct log_RCIN pkt = {
         LOG_PACKET_HEADER_INIT(LOG_RCIN_MSG),
         time_us       : AP_HAL::micros64(),