diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index 167a8d3dc0..e31a827e04 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -711,7 +711,7 @@ transport:
       # Enable/disable DTLS 1.2 support
       enabled: "${COAP_DTLS_ENABLED:false}"
      # RFC7925_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS = 9000
-      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS:9000}"
+      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_MS:9000}"
       # CoAP DTLS bind address
       bind_address: "${COAP_DTLS_BIND_ADDRESS:0.0.0.0}"
       # CoAP DTLS bind port
diff --git a/transport/coap/src/main/resources/tb-coap-transport.yml b/transport/coap/src/main/resources/tb-coap-transport.yml
index 3fe7aa4896..edc09641a7 100644
--- a/transport/coap/src/main/resources/tb-coap-transport.yml
+++ b/transport/coap/src/main/resources/tb-coap-transport.yml
@@ -98,7 +98,7 @@ transport:
       # Enable/disable DTLS 1.2 support
       enabled: "${COAP_DTLS_ENABLED:false}"
       # RFC7925_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS = 9000
-      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS:9000}"
+      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_MS:9000}"
       # CoAP DTLS bind address
       bind_address: "${COAP_DTLS_BIND_ADDRESS:0.0.0.0}"
       # CoAP DTLS bind port
diff --git a/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml b/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
index e5732a710a..999ad9b075 100644
--- a/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
+++ b/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
@@ -106,7 +106,7 @@ transport:
   coap:
     dtls:
       # RFC7925_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS = 9000
-      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS:9000}"
+      retransmission_timeout: "${COAP_DTLS_RETRANSMISSION_TIMEOUT_MS:9000}"
   lwm2m:
     # Enable/disable lvm2m transport protocol.
     enabled: "${LWM2M_ENABLED:true}"