diff --git a/src/core/meshcop/dtls.cpp b/src/core/meshcop/dtls.cpp
index b6a242253..cb6d465f3 100644
--- a/src/core/meshcop/dtls.cpp
+++ b/src/core/meshcop/dtls.cpp
@@ -103,8 +103,8 @@ otError Dtls::Start(bool aClient, ConnectedHandler aConnectedHandler, ReceiveHan
     mbedtls_ctr_drbg_init(&mCtrDrbg);
     mbedtls_entropy_init(&mEntropy);
 
-    mbedtls_debug_set_threshold(4);
-
+    // mbedTLS's debug level is almost the same as OpenThread's
+    mbedtls_debug_set_threshold(OPENTHREAD_CONFIG_LOG_LEVEL);
     otPlatRadioGetIeeeEui64(GetInstance(), eui64.m8);
     rval = mbedtls_ctr_drbg_seed(&mCtrDrbg, mbedtls_entropy_func, &mEntropy, eui64.m8, sizeof(eui64));
     VerifyOrExit(rval == 0);