diff --git a/src/lmic/lmic.h b/src/lmic/lmic.h
index caa7b379..c9f31ba5 100644
--- a/src/lmic/lmic.h
+++ b/src/lmic/lmic.h
@@ -105,7 +105,7 @@ extern "C"{
 #define ARDUINO_LMIC_VERSION_CALC(major, minor, patch, local)	\
 	(((major) << 24ul) | ((minor) << 16ul) | ((patch) << 8ul) | ((local) << 0ul))
 
-#define	ARDUINO_LMIC_VERSION	ARDUINO_LMIC_VERSION_CALC(3, 0, 99, 3)	/* v3.0.99.3 */
+#define	ARDUINO_LMIC_VERSION	ARDUINO_LMIC_VERSION_CALC(3, 0, 99, 4)	/* v3.0.99.4 */
 
 #define	ARDUINO_LMIC_VERSION_GET_MAJOR(v)	\
 	(((v) >> 24u) & 0xFFu)
diff --git a/src/lmic/lmic_as923.c b/src/lmic/lmic_as923.c
index d66c10a7..f46f50b0 100644
--- a/src/lmic/lmic_as923.c
+++ b/src/lmic/lmic_as923.c
@@ -85,7 +85,7 @@ LMICas923_getUplinkDwellBit(uint8_t mcmd_txparam) {
 static uint8_t
 LMICas923_getDownlinkDwellBit(uint8_t mcmd_txparam) {
         if (mcmd_txparam == 0xFF)
-                return 0;
+                return AS923_INITIAL_TxParam_DownlinkDwellTime;
 
         return (mcmd_txparam & MCMD_TxParam_RxDWELL_MASK) != 0;
 }
diff --git a/src/lmic/lorabase_as923.h b/src/lmic/lorabase_as923.h
index 74909650..d65bb75d 100644
--- a/src/lmic/lorabase_as923.h
+++ b/src/lmic/lorabase_as923.h
@@ -97,6 +97,8 @@ enum { AS923_V102_TX_CAP = 100 };		// v1.0.2 allows 100%
 enum {
         // initial value of UplinkDwellTime before TxParamSetupReq received.
         AS923_INITIAL_TxParam_UplinkDwellTime = 1,
+        // initial value of DownlinkDwellTime before TxParamSetupReq received.
+        AS923_INITIAL_TxParam_DownlinkDwellTime = 1,
         AS923_UPLINK_DWELL_TIME_osticks = sec2osticks(20),
 };