diff --git a/lib/arduino-lmic-1.5.0-arduino-2-tweaked/src/lmic/radio.c b/lib/arduino-lmic-1.5.0-arduino-2-tweaked/src/lmic/radio.c
index 0fffaa4f..6c570545 100644
--- a/lib/arduino-lmic-1.5.0-arduino-2-tweaked/src/lmic/radio.c
+++ b/lib/arduino-lmic-1.5.0-arduino-2-tweaked/src/lmic/radio.c
@@ -791,7 +791,7 @@ void radio_irq_handler (u1_t dio) {
             readBuf(RegFifo, LMIC.frame, LMIC.dataLen);
             // read rx quality parameters
             //LMIC.snr  = readReg(LORARegPktSnrValue); // SNR [dB] * 4
-            LMIC.snr  = readReg(LORARegPktSnrValue) / 4;
+            LMIC.snr  = ((s1_t)readReg(LORARegPktSnrValue)) / 4;
             //LMIC.rssi = readReg(LORARegPktRssiValue) - 125 + 64; // RSSI [dBm] (-196...+63)
             LMIC.rssi = readReg(LORARegPktRssiValue) - 157; // RFI_HF for 868 and 915MHZ band
             if (LMIC.snr < 0)