diff --git a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/mbed_lib.json b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/mbed_lib.json
index e5d63766e6..f3a1cd359c 100644
--- a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/mbed_lib.json
+++ b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/mbed_lib.json
@@ -3,9 +3,9 @@
     "config": {
         "heap-size": 32500,
         "use-malloc-for-heap": false,
-        "6lowpan-nd-channel-mask": "(1<<12)",
+        "6lowpan-nd-channel-mask": "0x7fff800",
         "6lowpan-nd-channel-page": 0,
-        "6lowpan-nd-channel": 12,
+        "6lowpan-nd-channel": 0,
         "6lowpan-nd-panid-filter": "0xffff",
         "6lowpan-nd-security-mode": "NONE",
         "6lowpan-nd-psk-key-id": 1,
diff --git a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/nd_tasklet.c b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/nd_tasklet.c
index e3eab47677..efd4299348 100644
--- a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/nd_tasklet.c
+++ b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/nd_tasklet.c
@@ -106,7 +106,7 @@ static void initialize_channel_list(void)
 
     tr_debug("Channel: %ld", channel);
     tr_debug("Channel page: %d", tasklet_data_ptr->channel_list.channel_page);
-    tr_debug("Channel mask: %ld", tasklet_data_ptr->channel_list.channel_mask[word_index]);
+    tr_debug("Channel mask: 0x%.8lx", tasklet_data_ptr->channel_list.channel_mask[word_index]);
 }
 
 /*
diff --git a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/thread_tasklet.c b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/thread_tasklet.c
index 676b0c786b..5a307159da 100644
--- a/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/thread_tasklet.c
+++ b/features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/thread_tasklet.c
@@ -274,8 +274,8 @@ void thread_tasklet_configure_and_connect_to_network(void)
     thread_tasklet_data_ptr->channel_list.channel_mask[0] = MBED_CONF_MBED_MESH_API_THREAD_CONFIG_CHANNEL_MASK;
     
     TRACE_DETAIL("channel page: %d", thread_tasklet_data_ptr->channel_list.channel_page);
-    TRACE_DETAIL("channel mask: %d", (int)thread_tasklet_data_ptr->channel_list.channel_mask[0]);
-          
+    TRACE_DETAIL("channel mask: 0x%.8lx", thread_tasklet_data_ptr->channel_list.channel_mask[0]);
+
     // PSKd
     const char PSKd[] = MBED_CONF_MBED_MESH_API_THREAD_PSKD;
     MBED_ASSERT(sizeof(PSKd) > 5 && sizeof(PSKd) < 33);