diff --git a/.travis.yml b/.travis.yml
index fde8606ac3..f00daccfca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -90,6 +90,7 @@ env:
   - RTT_BSP='stm32/stm32f429-armfly-v6' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32f429-atk-apollo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32f429-fire-challenger' RTT_TOOL_CHAIN='sourcery-arm'
+  - RTT_BSP='stm32/stm32f446-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32f767-atk-apollo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32f767-fire-challenger' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l475-atk-pandora' RTT_TOOL_CHAIN='sourcery-arm'
diff --git a/tools/mkdist.py b/tools/mkdist.py
index cf30e95284..9d90e95e55 100644
--- a/tools/mkdist.py
+++ b/tools/mkdist.py
@@ -119,7 +119,7 @@ def bsp_update_kconfig(dist_dir):
                 found = 1
             if line.find('default') != -1 and found:
                 position = line.find('default')
-                line = line[0:position] + 'default: "rt-thread"\n'
+                line = line[0:position] + 'default "rt-thread"\n'
                 found = 0
             f.write(line)